1. Hoyle, F. and Wickramasinghe, N.C. (1985) Living Comets. Cardiff University Press, Cardiff.
2. Hoover, R.B., Frontasyeva, M., Pavlov, S., et al. (2021) ENAA and SEM Investigations of Carbonaceous Meteorites: Implications to the Distribution of Life and Biospheres. Academia Journal of Scientific Research, 9, 94-104.
3. Rosetta Images of Comet 67P/Churyumov–Gerasimenko: Inferences from Its Terrain and Structure
4. ROSETTA STUDIES OF COMET 67P/CHURYUMOV–GERASIMENKO: PROSPECTS FOR ESTABLISHING COMETARY BIOLOGY