Pólya, George creator text wb Berlin New York Springer 1972-76 1972 1976 monographic eng ger

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2 v. 25 cm. [by] G. Pólya [and] G. Szegö. Translation by D. Aeppli. Vol. 2 translated by C. E. Billigheimer. Rev. and enl. translation of Aufgaben und Lehrsä467. QA301 .P64413 515/.076 0387056726 (v. 1) (New York) 75189312 //r853 720822 20160527195742.0 37576