@book{UBHD-1035401, author={Escher, Maurits C.}, title={The graphic work of M. C. Escher}, edition={New, rev. and expanded ed., 6. impr.}, publisher={Oldbourne}, address={London}, year={1972}, pages={16, 76 S.}, language={eng}, library={UB [Signatur: 72 C 622]}, }