المؤلفون: Pennock, David M., Flake, Gary W., Lawrence, Steve, Glover, Eric J., Giles, C. Lee

المصدر: Proceedings of the National Academy of Sciences of the United States of America, 2002 Apr . 99(8), 5207-5211.

الوصول الحر: https://www.jstor.org/stable/3058470Test

المؤلفون: Lawrence, Steve, Giles, C. Lee

المصدر: Science, 1998 Apr 01. 280(5360), 98-100.

الوصول الحر: https://www.jstor.org/stable/2895232Test