Chemical preservation of plants and insects in natural resins

af Stankiewicz, B. A., Poinar, H. N., Briggs, D. E. G., Evershed, R. P., Poinar, G. O.
Udgivet 1998

Bacillus DNA in fossil bees: an ancient symbiosis?

af Cano, R J, Borucki, M K, Higby-Schweitzer, M, Poinar, H N, Poinar, G O, Pollard, K J
Udgivet 1994