@book {4065, title = {Discrete Mathematics: A) The Mathematics of Computer Science, B) Problems and Solutions}, year = {2008}, author = {Christos Bouras and Lefteris Kirousis and Paul Spirakis and George Voutsadakis} } @book {3151, title = {Introduction to graphs: Theory, problems and solutions}, series = {Gutenberg}, year = {1999}, author = {Christos Bouras and Lefteris Kirousis and Paul Spirakis and G Stamatiou} } @book {3152, title = {Discrete Mathematics: Problems and Solutions}, series = {Gutenberg}, year = {1994}, author = {Christos Bouras and Lefteris Kirousis and Paul Spirakis and G Voutsadakis} } @book {3153, title = {Discrete Mathematics}, series = {Gutenberg}, year = {1992}, author = {Christos Bouras and Lefteris Kirousis and Paul Spirakis} }