@inbook{403972, title = {IX. kapitola. N\v ekolik d\r ule\v zit\'ych \'uloh}, booktitle = {Kombinatorika}, series = {GDML\_Books}, publisher = {Mlad\'a fronta}, address = {Praha}, year = {1980}, pages = {73-88}, url = {http://dml.mathdoc.fr/item/403972} }
(éd.). IX. kapitola. Několik důležitých úloh, dans Kombinatorika, GDML_Books, (1980), pp. 73-88. http://gdmltest.u-ga.fr/item/403972/