FUNDAMENTA MATHEMATICAE. Warsaw,1(1920)-32(1939); 33(1945)-  Fund.Math.	---> FG-1   (1920); 6(1924)-8(1926); 10(1927)-76(1972). lac. 63(1968) n.1
ISSN 0016-2736	Publisher : Polish Academy of Sciences.  Institute of Mathematics.