by Klein, Harold P., Horowitz, Norman H., Levin, Gilbert V., Oyama, Vance I., Lederberg, Joshua, Rich, Alexander, Hubbard, Jerry S., Hobby, George L., Straat, Patricia A., Berdahl, Bonnie J., Carle, Glenn C., Brown, Frederick S., Johnson, Richard D.
Published in Science (American Association for the Advancement of Science) (01.10.1976)

by Oyama, V I, Berdahl, B J
Published in Journal of molecular evolution (01.12.1979)

by Schein, A, Berdahl, B J, Low, M, Borek, E
Published in Biochimica et biophysica acta (20.07.1972)