00691nam0-22002531i-450-990001273740403321000127374FED01000127374(Aleph)000127374FED0100012737420000920d1973----km-y0itay50------baengHow to solve ita new aspect of mathematical methodsby PolyaPrinceton [N.J.]Princeton University Press1973Pólya,Georg344716ITUNINARICAUNIMARCBK99000127374040332110-L-2420103MA1MA1How to solve it380505UNINAING01