00321nam 2267981 450000100060000000300230000600500090002900800410003808200080007907200160008702000130010310000110011626000240012724500260015167981StarLibrary Marc Built20180420201711 ||||| |||||||||||amh  a511 amathematics aبدون avatssa bWissenschaft c1986 adiscrete mathematiccs