Alte probleme- neue ls̲ungen in den exakten Wissenschaften : F nf Wiener vortrg̃e : Zweiter Zyklus.
Circle-squaring.
Interplanetary voyages.
Chemical elements.
Biochemistry.
Infinite.
Menger, Karl, 1902-1985
Thirring, Hans, 1888-1976
Mark, H. F. (Herman Francis), 1895-1992
Scheminzky, Ferdinand, 1899-1973.
Hahn, Hans, 1879-1934.