@inbook{403896,
title = {4. kapitola. Je\v st\v e p\v etadvacet \'uloh},
booktitle = {Princip matematick\'e indukce},
series = {GDML\_Books},
publisher = {Mlad\'a fronta},
address = {Praha},
year = {1977},
pages = {69-113},
url = {http://dml.mathdoc.fr/item/403896}
}
(éd.). 4. kapitola. Ještě pětadvacet úloh, dans Princip matematické indukce, GDML_Books, (1977), pp. 69-113. http://gdmltest.u-ga.fr/item/403896/