Rolf Kohring, Thomas Schlüter und Johannes Mehl, "Hyperstotic fish bones ("Tilly bones") from presumably Pliocene phosphorites of the Lake Manyara area, northern Tanzania", Sonderdruck aus Paläontologische Zeitschrift 66 (1992), S. 129-136; Rolf Kohring, "Structure and Biomineralization of Eggshell of Elaphe guttata (Linné 1766) (Serpentes: Colubridae). Dedicated to Karl F. Hirsch (1921-1996)", Sonderdruck aus Ders. (Hg.), "Miscellanea Palaeontologica. 5 Band", Berlin 1996 (= Berliner geowississenschaftliche Abhandlungen, Reihe E 18), S. 191-200;