@book{404141, title = {Algebra, ka\v zd\'y za\v c\'atek je lehk\'y}, series = {GDML\_Books}, publisher = {Mlad\'a fronta}, address = {Praha}, year = {1986}, language = {cs}, url = {http://dml.mathdoc.fr/item/404141} }
Kästner, Herbert; Göthner, Peter. Algebra, každý začátek je lehký. GDML_Books (1986), http://gdmltest.u-ga.fr/item/404141/