@book{404164, title = {Matematick\'e hlavolamy a z\'aklady teorie grup}, series = {GDML\_Books}, publisher = {Mlad\'a fronta}, address = {Praha}, year = {1988}, language = {cs}, url = {http://dml.mathdoc.fr/item/404164} }
Tůma, Jiří. Matematické hlavolamy a základy teorie grup. GDML_Books (1988), http://gdmltest.u-ga.fr/item/404164/