Citation: El. Yochelson, Concerning the concept of extinct classes of Mollusca: or what may/may notbe a class of mollusks, AM MALAC B, 15(2), 2000, pp. 195-202
Citation: Jor. Ebbestad et El. Yochelson, Isostrophic molluscs (Tergomya and Gastropoda) from the Upper Ordovician of Norway, NORSK GEOL, 80(3), 2000, pp. 187-202
Citation: Dm. Rohr et El. Yochelson, Life association of shell and operculum of Middle Ordovician gastropod Maclurites, J PALEONTOL, 73(6), 1999, pp. 1078-1080