@book{403664, title = {Dokonal\'e a spriatelen\'e \v c\'\i sla}, series = {GDML\_Books}, publisher = {Mlad\'a fronta}, address = {Praha}, year = {1969}, language = {cs}, url = {http://dml.mathdoc.fr/item/403664} }
Šalát, Tibor. Dokonalé a spriatelené čísla. GDML_Books (1969), http://gdmltest.u-ga.fr/item/403664/