Protheroe, Ray J.; C.L. Bhat; P. Fleury; E. Lorenz; M. Teshima; T.C. Weekes (12 October 1997). "Very high energy gamma rays from Markarian 501". arXiv:astro-ph/9710118.
Albert J, Ellis J, Mavromatos NE, Nanopoulos DV, Sakharov AS, Sarkisyan EKG (2008). "Probing quantum gravity using photons from a flare of the active galactic nucleus Markarian 501 observed by the MAGIC telescope". Physics Letters B. 668 (4): 253–257. arXiv:0708.2889. Bibcode:2008PhLB..668..253M. doi:10.1016/j.physletb.2008.08.053. S2CID5103618.
Bondi, M.; L. Feretti; M. Giroletti; K.-H. Mack; F. Mantovani; C. Stanghellini; T. Venturi; D. Dallacasa; et al. "Very Long Baseline Interferometry Research". Instituto di Radioastronomia. Archived from the original on 3 February 2010. Retrieved 6 December 2011. with further detail at Giroletti, M.; Giovannini, G.; Feretti, L.; Cotton, W. D.; Edwards, P. G.; Lara, L.; Marscher, A. P.; Mattox, J. R.; Piner, B. G.; Venturi, T. (2004). "Parsec‐Scale Properties of Markarian 501". The Astrophysical Journal. 600 (1): 127–140. arXiv:astro-ph/0309285. Bibcode:2004ApJ...600..127G. doi:10.1086/379663. S2CID18078543.
Giroletti, M.; G. Giovannini; L. Feretti; W.D. Cotton; P.G. Edwards; L. Lara; A.P. Marscher; J.R. Mattox; et al. (11 September 2003). "Parsec Scale Properties of Markarian 501"(PDF). Retrieved 6 December 2011.
cnr.it
ira.cnr.it
Bondi, M.; L. Feretti; M. Giroletti; K.-H. Mack; F. Mantovani; C. Stanghellini; T. Venturi; D. Dallacasa; et al. "Very Long Baseline Interferometry Research". Instituto di Radioastronomia. Archived from the original on 3 February 2010. Retrieved 6 December 2011. with further detail at Giroletti, M.; Giovannini, G.; Feretti, L.; Cotton, W. D.; Edwards, P. G.; Lara, L.; Marscher, A. P.; Mattox, J. R.; Piner, B. G.; Venturi, T. (2004). "Parsec‐Scale Properties of Markarian 501". The Astrophysical Journal. 600 (1): 127–140. arXiv:astro-ph/0309285. Bibcode:2004ApJ...600..127G. doi:10.1086/379663. S2CID18078543.
Albert J, Ellis J, Mavromatos NE, Nanopoulos DV, Sakharov AS, Sarkisyan EKG (2008). "Probing quantum gravity using photons from a flare of the active galactic nucleus Markarian 501 observed by the MAGIC telescope". Physics Letters B. 668 (4): 253–257. arXiv:0708.2889. Bibcode:2008PhLB..668..253M. doi:10.1016/j.physletb.2008.08.053. S2CID5103618.
Bondi, M.; L. Feretti; M. Giroletti; K.-H. Mack; F. Mantovani; C. Stanghellini; T. Venturi; D. Dallacasa; et al. "Very Long Baseline Interferometry Research". Instituto di Radioastronomia. Archived from the original on 3 February 2010. Retrieved 6 December 2011. with further detail at Giroletti, M.; Giovannini, G.; Feretti, L.; Cotton, W. D.; Edwards, P. G.; Lara, L.; Marscher, A. P.; Mattox, J. R.; Piner, B. G.; Venturi, T. (2004). "Parsec‐Scale Properties of Markarian 501". The Astrophysical Journal. 600 (1): 127–140. arXiv:astro-ph/0309285. Bibcode:2004ApJ...600..127G. doi:10.1086/379663. S2CID18078543.
Albert J, Ellis J, Mavromatos NE, Nanopoulos DV, Sakharov AS, Sarkisyan EKG (2008). "Probing quantum gravity using photons from a flare of the active galactic nucleus Markarian 501 observed by the MAGIC telescope". Physics Letters B. 668 (4): 253–257. arXiv:0708.2889. Bibcode:2008PhLB..668..253M. doi:10.1016/j.physletb.2008.08.053. S2CID5103618.
Barbieri, G; G. Romano (1977). "The optical variability of the galaxy Markarian 501". Acta Astronomica. 27 (2): 195–197. Bibcode:1977AcA....27..195B.
Bondi, M.; L. Feretti; M. Giroletti; K.-H. Mack; F. Mantovani; C. Stanghellini; T. Venturi; D. Dallacasa; et al. "Very Long Baseline Interferometry Research". Instituto di Radioastronomia. Archived from the original on 3 February 2010. Retrieved 6 December 2011. with further detail at Giroletti, M.; Giovannini, G.; Feretti, L.; Cotton, W. D.; Edwards, P. G.; Lara, L.; Marscher, A. P.; Mattox, J. R.; Piner, B. G.; Venturi, T. (2004). "Parsec‐Scale Properties of Markarian 501". The Astrophysical Journal. 600 (1): 127–140. arXiv:astro-ph/0309285. Bibcode:2004ApJ...600..127G. doi:10.1086/379663. S2CID18078543.
"Results for Mrk 501". MARKARIAN2 – Markarian Galaxies Optical Database. Archived from the original on 2010-06-23. Retrieved 2011-12-06. Data base query page is at [1]. Fill in Mrk 501 for name and click start search at bottom of page.
Albert J, Ellis J, Mavromatos NE, Nanopoulos DV, Sakharov AS, Sarkisyan EKG (2008). "Probing quantum gravity using photons from a flare of the active galactic nucleus Markarian 501 observed by the MAGIC telescope". Physics Letters B. 668 (4): 253–257. arXiv:0708.2889. Bibcode:2008PhLB..668..253M. doi:10.1016/j.physletb.2008.08.053. S2CID5103618.
Bondi, M.; L. Feretti; M. Giroletti; K.-H. Mack; F. Mantovani; C. Stanghellini; T. Venturi; D. Dallacasa; et al. "Very Long Baseline Interferometry Research". Instituto di Radioastronomia. Archived from the original on 3 February 2010. Retrieved 6 December 2011. with further detail at Giroletti, M.; Giovannini, G.; Feretti, L.; Cotton, W. D.; Edwards, P. G.; Lara, L.; Marscher, A. P.; Mattox, J. R.; Piner, B. G.; Venturi, T. (2004). "Parsec‐Scale Properties of Markarian 501". The Astrophysical Journal. 600 (1): 127–140. arXiv:astro-ph/0309285. Bibcode:2004ApJ...600..127G. doi:10.1086/379663. S2CID18078543.
"Results for Mrk 501". MARKARIAN2 – Markarian Galaxies Optical Database. Archived from the original on 2010-06-23. Retrieved 2011-12-06. Data base query page is at [1]. Fill in Mrk 501 for name and click start search at bottom of page.
Bondi, M.; L. Feretti; M. Giroletti; K.-H. Mack; F. Mantovani; C. Stanghellini; T. Venturi; D. Dallacasa; et al. "Very Long Baseline Interferometry Research". Instituto di Radioastronomia. Archived from the original on 3 February 2010. Retrieved 6 December 2011. with further detail at Giroletti, M.; Giovannini, G.; Feretti, L.; Cotton, W. D.; Edwards, P. G.; Lara, L.; Marscher, A. P.; Mattox, J. R.; Piner, B. G.; Venturi, T. (2004). "Parsec‐Scale Properties of Markarian 501". The Astrophysical Journal. 600 (1): 127–140. arXiv:astro-ph/0309285. Bibcode:2004ApJ...600..127G. doi:10.1086/379663. S2CID18078543.