@book{403985,
title = {Zaj\'\i mav\'e dvojice troj\'uheln\'\i k\r u},
series = {GDML\_Books},
publisher = {Mlad\'a fronta},
address = {Praha},
year = {1980},
language = {cs},
url = {http://dml.mathdoc.fr/item/403985}
}
Niederle, Arnošt. Zajímavé dvojice trojúhelníků. GDML_Books (1980), http://gdmltest.u-ga.fr/item/403985/