1. S. Arrhenius, "Vernaldas Ultveckling", Stockholm, 1908. Quoted by A. I. Oparin in "Genesis and Evolutionary Development of Life", Academic Press, New York.

2. I. Shklovskii and C. Sagan, "Intelligent Life in the Universe", Dell, 1966.

3. F. H. Crick and L. E. Orgel, "Directed Panspermia", Icarus 19, 341, 1973.

4. M. Meot-Ner (Mautner) and G. L. Matloff, "Directed Panspermia: A Technical and Ethical Evaluation of Seeding Nearby Solar Systems. J. British Interplanet. Soc. 32, 419-423 (1979).

5. M. N. Mautner, "Directed Panspermia. 2. Technological Advances Toward Seeding Other Solar Systems, and the Foundations of Panbiotic Ethics", J. British Interplanet. Soc. 48, 435-440 (1995).

6. M. N. Mautner and G. L. Matloff, "An Evaluation of Interstellar Propulsion Methods for Seeding New Solar Systems", Proceedings of the First IAA Conference on Realistic Deep-Space Missions, Turin, Italy, June 1996, Levrotto and Bella, Turin (1996).

7. B. Zuckerman, "Space Telescopes, Interstellar Probes and Directed Panspermia", J. British Interplanet. Soc. 34, 367-370 (1979).

8. P. G. Mezger, "The Search for Protostars Using Millimeter/Submillimeter Dust Emission as a Tracer", in Planetary Systems: Formation, Evolution and Detection, ed. B. F. Burke, J. H. Rahe and E. E. Roettger, Kluwer Academic Publishers, Dordrecht, p. 197-214, 1994.

9. V. S. Safronov and E. L. Ruskol, "Formation and Evolution of Planets", in Planetary Systems: Formation, Evolution and Detection, ed. B. F. Burke, J. H. Rahe and E. E. Roettger, Kluwer Academic Publishers, Dordrecht, p. 13-22, 1994.

10. R. Neuhauser and J. V. Feitzinger, "Radial Migration of Planetisimals", in Planetary Systems: Formation, Evolution and Detection, ed. B. F. Burke, J. H. Rahe and E. E. Roettger, Kluwer Academic Publishers, Dordrecht, p. 49-56, 1994.

11. M. E. Bailey, S. V. M Clube and W. M. Napier, "The Origin of Comets", Pergamon Press, Oxford, 1990, p. 435.

12. J. H. Oort, "Orbital Distribution of Comets", in W. F. Huebner, ed. "Physics and Chemistry of Comets", Springer-Verlag, Berlin, 1990.

13. J. Davies, "Frozen in Time", New Scientist p. 36-39, 13 April, 1996.

14. D. Morrison, "Sizes and Albedos of the Larger Asteroids", in Comets, Asteroids and Meteorites, Interrelations, Evolution and Origins, A.H. Delsemme, ed., U. of Toledo Press, p. 177-183, 1977.

15. Z. Sekanina, "Meteor Streams in the Making", in Comets, Asteroids and Meteorites, Interrelations, Origins and Evolution, A.H. Delsemme, ed., U. of Toledo Press, p. 159-169, 1977.

16. a . F. T. Kyte and J. T. Wasson, "Accretion Rate of Extraterrestrial Matter: Iridium Deposited 33 to 67 Million Years Ago", Science 232, 1225-1229 (1989). b. G. W. Wetherill, "Fragmentation of Asteroids and Delivery of Fragments to Earth", in Comets, Asteroids and Meteorites, Interrelations, Evolution and Origins, A.H. Delsemme, ed., U. of Toledo Press, p. 283-291, 1977.

17. F. Hoyle and C. Wickramasinghe, "Lifecloud: the Origin of Life in the Universe", J. M. Dent and Sons, London, 1978.

18. M. N. Mautner, R. L. Leonard and D. W. Deamer, "Meteorite Organics in Planetary Environments: Hydrothermal Release, Surface Activity and Microbial Utilisation", Planet. Space Sci., 43, 139-147 (1995)

19. M. N. Mautner, "Biological Properties of Meteorite Materials: Macronutrients and Growth in Carbonaceous Chondrites", submitted, 1996. Observations for Pseudomonas fluorescence from K. Killham and for Thermus and Thermotoga from H. W. Morgan, for plant cultures from A. J. Conner, private communication, 1996.

20. E. Anders, "Prebiotic Organic Matter from Comets and Asteroids", Nature 342, 255-257 (1989).

21. T. Owen, "The Search for Other Planets: Clues from the Solar System", in Planetary Systems: Formation, Evolution and Detection, ed. B. F. Burke, J. H. Rahe and E. E. Roettger, Kluwer Academic Publishers, Dordrecht, p. 1-11, 1994.

22. G. W. Wetherill, "Possible Consequences of Absence of "Jupiters" in Planetary Systems, in Planetary Systems: Formation, Evolution and Detection, ed. B. F. Burke, J. H. Rahe and E. E. Roettger, Kluwer Academic Publishers, Dordrecht, p. 23-32, 1994.

23.B. C. Clark, "Primeval Procreative Comet Pond", Origins of Life 18, 209-238 (1988).

24. 6. J. H. Mauldin, "Prospects for Interstellar Travel", AAS Publications, Univelt, San Diego, 1992.

25. M. Zeilik, S.A. Gregory and E. P. Smith, "Astronomy and Astrophysics", Saunders, Fort Worth, p. 383, 1992.

26. D. S. McKay, E. K. Gibson, K. L. Thomas-Kerpta, H. Vali, C. S. Romanek, S. J. Clemett, X. D. F. Chillier, C. R. Maechling and R. N. Zare, " Search for Past Life on Mars: Possible Relic Biogenic Activity in Martian Meteorite ALH84001", Science 273, 924-930 (1996)

27. Chyba, C. F. and McDonald, G. D. "The Origin of Life in the Solar System: Current Issues", Annu. Rev. Earth Planet. Sci., 1995, 23, 215-249.