@book{Witt2013, author = {Witt, Kurt-Ulrich}, title = {Elementare Kombinatorik f{\"u}r die Informatik}, isbn = {978-3-658-00993-9}, doi = {10.1007/978-3-658-00994-6}, institution = {Fachbereich Informatik}, year = {2013}, language = {de} }