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Jetsu, L.; Porceddu, S.; Lyytinen, J.; Kajatkari, P.; Lehtinen, J.; Markkanen, T.; et al. Did the Ancient Egyptians Record the Period of the Eclipsing Binary Algol - The Raging One?. The Astrophysical Journal. 2013, 773 (1): A1 (14pp). Bibcode:2013ApJ...773....1J. arXiv:1204.6206. doi:10.1088/0004-637X/773/1/1.
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Porceddu, S.; Jetsu, L.; Lyytinen, J.; Kajatkari, P.; Lehtinen, J.; Markkanen, T.; et al. Evidence of Periodicity in Ancient Egyptian Calendars of Lucky and Unlucky Days. Cambridge Archaeological Journal. 2008, 18 (3): 327–339. Bibcode:2008CArcJ..18..327P. doi:10.1017/S0959774308000395.
Jetsu, L.; Porceddu, S.; Lyytinen, J.; Kajatkari, P.; Lehtinen, J.; Markkanen, T.; et al. Did the Ancient Egyptians Record the Period of the Eclipsing Binary Algol - The Raging One?. The Astrophysical Journal. 2013, 773 (1): A1 (14pp). Bibcode:2013ApJ...773....1J. arXiv:1204.6206. doi:10.1088/0004-637X/773/1/1.
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Quirion, P.-O.; Fontaine, G.; Brassard, P. Mapping the Instability Domains of GW Vir Stars in the Effective Temperature-Surface Gravity Diagram. The Astrophysical Journal Supplement Series. 2007, 171 (1): 219–248. Bibcode:2007ApJS..171..219Q. doi:10.1086/513870.