Hell, Pavol. Nesetril, Jaroslav.
Graphs and homomorphisms - Oxford, New York : Oxford University Press 2004. - xii, 244 p. - Oxford lecture series in mathematics and its applications:28 .
0198528175
Graph theory.
Homomorphisms (Mathematics)
519.17 HELL
Graphs and homomorphisms - Oxford, New York : Oxford University Press 2004. - xii, 244 p. - Oxford lecture series in mathematics and its applications:28 .
0198528175
Graph theory.
Homomorphisms (Mathematics)
519.17 HELL