Sugisaki, Ryuichi; Ohashi, Masayoshi; Sugitani, Kenichiro; Suzuki, Kazuhiro (1987): Compositional variations in manganese micronodules; a possible indicator of sedimentary environments. University of Chicago Press, Chicago, IL, United States, Journal of Geology, 95 (4), 433-454, georefid:1987-080145