T. J. (1962), “The occurrence and ignificance of lead isotopes in pelagicsediments”, Geochimica et Cosmochimica Acta 26: 263–308, doi:10.1016/0016-7037(62)90016-9
1450. ^ a b c d e f g h McCall, Christian R. A. (2023-12-13). “A large pelagic lobopodian from the Cambrian Pioche Shale of Nevada” (英語). Journal of Paleontology: