@book{402685, title = {Po\v cet differenci\'aln\'\i }, series = {GDML\_Books}, publisher = {Jednota \v ceskoslovensk\'ych mathematik\r u a fysik\r u}, address = {Praha}, year = {1923}, language = {cs}, url = {http://dml.mathdoc.fr/item/402685} }
Petr, Karel. Počet differenciální. GDML_Books (1923), http://gdmltest.u-ga.fr/item/402685/