OBeron plus classes and methods By H. MoessenBoeck & J. Templ, 1989. See OBeron-2. ["OBject OBeron - An OBject-Oriented Extension of OBeron", H. MoessenBoeck et al, ETH TR 109 (Apr 1990)]. ["OBject OBeron - A Modest OBject-Oriented Language", H. MoessenBoeck & J. Templ, in Structured Programming 10(4), 1989].