A'Hearn, M.F. et al. (2005). Whence comets? Science 314, 1708–1709.
Bailey, M.E., Clube, S.V.M. & Napier, W.M. (1990). The Origin of Comets. Pergamon, Oxford.
Beichman, C.A. et al. (2005). An excess due to small grains around the nearby K0 V Star HD 69830: asteroid or cometary debris? Astrophys. J. 626, 1061–1069.
Cairns-Smith, A.G. (1966). The origin of life and the nature of the primitive gene. J. Theor. Biol. 10, 53.
Cairns-Smith, A.G. & Hartman, H. (eds) (1986). Clay Minerals and the Origin of Life. Cambridge University Press, Cambridge.
Carny, O. & Gazit, E. (2005). A model for the role of short self-assembled peptides in the very early stages of the origin of life. FASEB Journal 19, 1051–1055.
Cataldo, F. (2007). Radiation-induced racemization and amplification of chirality: implications for comets and meteorites. Int. J. Astrobiol. 6, 1–10.
Cha, J.N. et al. (2000). Biomimetic synthesis of ordered silica structures mediated by block copolypeptides. Nature 403, 289–292.
Gilbert, W. (1986). Origin of life: the RNA world. Nature 319, 618.
Grady, C.A. et al. (1997). The star-grazing extrasolar comets in the HD 100546 system. Astrophys. J. 483, 449–456.
Hazen, R.M. (2005). Genesis. Joseph Henry Press, Washington, DC.
Hecky, R.E. et al. (1973). The amino acid and sugar composition of diatom cell-walls. Marine Biol. 19, 323–331.
Hoyle, F. & Wickramasinghe, N.C. (1999). The universe and life: implications from the weak anthropic principle. Astrophys. Space Sci. 268, 89–102.
Jura, M. (2005). Direct detection of extra-solar comets is possible. Astron J. 130, 1261–1266.
Lin, L.F. et al. (2006). Long-term sustainability of a high-energy, low-diversity crustal biome. Science 314, 479–482.
Lisse, C.M. et al. (2006). Spitzer spectral observations of the Deep Impact ejecta. Science 313, 635–640.
Melnick, G.J. et al. (2001). Discovery of water vapour around IRC+10216 as evidence for comets orbiting another star. Nature 412, 160–163.
Morbidelli, A. et al. (2000). Source regions and timescales for the delivery of water to Earth. Meteor. Planet. Sci. 35, 1309–1320.
Napier, W.M. (2004). A mechanism for interstellar panspermia. Mon. Not. R. Astron. Soc. 348, 46–51.
Napier, W.M. (2007). Pollination of exoplanets by nebulae. Int. J. Astrobiol., in press.
Raymond, S.N., Quinn, T. & Lunine, J.L. (2004). Making other Earths: dynamical simulations of terrestrial planet formation and water delivery. Icarus 168, 1–17.
Sandford, S.A. et al. (2006). Organics captured from comet 81P/Wild 2 by the Stardust spacecraft. Science 314, 1720–1724.
Szostak, J.W., Bartel, D.P. & Luisi, P.L. (2001). Synthesizing life. Nature 409, 387–390.
Wallis, M. & Wickramasinghe, N.C. (2004). Interstellar transfer of planetary microbiota. Mon. Not. R. Astron. Soc. 348, 52.
Wickramasinghe, J.T. (2007). The role of comets in panspermia. PhD Thesis, Cardiff University.
Wickramasinghe, J.T., Wickramasinghe, N.C. & Wallis, M. (2008). Liquid water and organics in comets: implications for exobiology. Int. J. Astrobiol., in press.
Woese, C. (1968). The Genetic Code. Harper and Row, New York.
Ziegler, K. & Longstaffer, F.J. (2000). Clay Clay Minerals 48, 474–493.