title = {Determinatio areae et voluminis superficiei definitae per aequationem (x 2 + y 2 + z 2) 2 - a 2 x 2 - b 2 y 2 - c 2 z 2 = 0},
author = {Petrus Szymanski}, publisher = {Friedrich-Wilhelms-Universität zu Berlin}, url = {http://edoc.hu-berlin.de/ebind/hdiss/szymdete_PPN319980081/XML/}, year = {1876}, description = {ELIB Suchkatalog 2008},
keywords = {imported }