699 Hela (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "699 Hela" in English language version.

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books.google.com

Schmadel, Lutz (2003), Dictionary of minor planet names, vol. 1, Springer, p. 68, ISBN 9783540002383.

Angeli, C. A.; Lazzaro, D. (August 2002), "Spectral properties of Mars-crossers and near-Earth objects. Results of the S³OS² survey", Astronomy and Astrophysics, 391: 757–765, Bibcode:2002A&A...391..757A, doi:10.1051/0004-6361:20020834.

Angeli, C. A.; Lazzaro, D. (August 2002), "Spectral properties of Mars-crossers and near-Earth objects. Results of the S³OS² survey", Astronomy and Astrophysics, 391: 757–765, Bibcode:2002A&A...391..757A, doi:10.1051/0004-6361:20020834.
Alonso, E. Díez; et al. (April 2021), "Asteroids 4092 Tyr (Follow Up, Analysis, Preliminary Results) and 699 Hela (Spin-Shape Model)", Bulletin of the Minor Planets Section of the Association of Lunar and Planetary Observers, 48 (2): 136–139, Bibcode:2021MPBu...48..136A.

"Absolute Magnitude (H)". NASA/JPL. Archived from the original on 2 March 2001. Retrieved 24 June 2014.

"Absolute Magnitude (H)". NASA/JPL. Archived from the original on 2 March 2001. Retrieved 24 June 2014.