[Obálka]
Dokonalé a spriatelené čísla, GDML_Books, (1969), p. [i]-[ii] / Harvested from
Access to full text
Full (PDF) 
@inbook{403665,
     title = {[Ob\'alka]},
     booktitle = {Dokonal\'e a spriatelen\'e \v c\'\i sla},
     series = {GDML\_Books},
     publisher = {Mlad\'a fronta},
     address = {Praha},
     year = {1969},
     pages = {[i]-[ii]},
     url = {http://dml.mathdoc.fr/item/403665}
}

 (éd.). [Obálka], dans Dokonalé a spriatelené čísla, GDML_Books,  (1969), pp. [i]-[ii]. http://gdmltest.u-ga.fr/item/403665/