1. Bobrovnikoff, N.T., 1942. Contributions from the Perkins Observatory, vol. 16.
2. Buil, C., 2013. Comet C/2012 S1 (ISON)׳s spectrum. 〈http://www.astrosurf.com/buil/comet/ison/obs.htm〉.
3. Combi, M. R., Bertaux, J. L., Quemerais, E., 2013. Comet C/2012 S1 (ISON). IAUC 9266.
4. Secular light curve of comet 28P/Neujmin 1, and of comets targets of spacecraft, 1P/Halley, 9P/Tempel 1, 19P/Borrelly, 21P/Grigg-Skejellerup, 26P/Giacobinni-Zinner, 67P/Chruyumov-Gersimenko, 81P/Wild 2;Ferrín;Icarus,2005
5. Secular light curve of comets: 133P/Elst-Pizarro;Ferrín;Icarus,2006