Logan, Terry J.; Ryan, James A. (1993). “In situ lead immobilization by apatite”. Environmental Science & Technology 27 (9): 1803–1810. doi:10.1021/es00046a007
Geology, 2000, 28, 5, 427-430. ^ JOACHIMSKI M. M., BUGGISCH W., "Conodont apatite δ18O signatures indicate climatic cooling as a trigger of the Late Devonian