@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/