[1] Seifert.W.K. and Moldowan.J.M.: Frist proof of structure a C28 pentacyclic triertpane in petroleum, Nature, Vol.271, No.5644, 1978, 436—437.
[2] Moldowan.J.M. and Seifert.W.K.: Structure proof and segnificanee of steroisomerie 28, 30 bisnorhopanes in petroleum and petroleum source rocks, Geochimica et Cosmochimica Aeta Vol.48, 984, 1651—1661.
[3] Noble.R. Alexander.R. and Kagi, R.I.: The occurrence of bisnorhopane, trisnorhopane and 25 noehopanes as free hydrocarbons in some Aurtralian shaler, Org. Geoehem Vol. 8, No.2, 1985, 171—176. |
