Kolker, Allan (1982). "Mineralogy and Geochemistry of Fe-Ti Oxide and Apatite (Nelsonite) Deposits and Evaluation of the Liquid Immiscibility Hypothesis". Economic Geology. 77 (5): 1146–1158. CiteSeerX10.1.1.918.2121. doi:10.2113/gsecongeo.77.5.1146.
Kolker, Allan (1982). "Mineralogy and Geochemistry of Fe-Ti Oxide and Apatite (Nelsonite) Deposits and Evaluation of the Liquid Immiscibility Hypothesis". Economic Geology. 77 (5): 1146–1158. CiteSeerX10.1.1.918.2121. doi:10.2113/gsecongeo.77.5.1146.