30th International Mathematical Olympiad.: Braunschweig, 1989/
Langmann, H. H.
30th International Mathematical Olympiad.: Braunschweig, 1989/ H. H. Langmann. - [1st ed.] - Bad Honnef: K.H. Bock, 1990. - 79 p.
510.79 / L284
30th International Mathematical Olympiad.: Braunschweig, 1989/ H. H. Langmann. - [1st ed.] - Bad Honnef: K.H. Bock, 1990. - 79 p.
510.79 / L284