@book{402923, title = {Perspektiva}, series = {GDML\_Books}, publisher = {P\v r\'\i rodov\v edeck\'e nakladatelstv\'\i }, address = {Praha}, year = {1951}, language = {cs}, url = {http://dml.mathdoc.fr/item/402923} }
Kraemer, Emil. Perspektiva. GDML_Books (1951), http://gdmltest.u-ga.fr/item/402923/