@book{cbdu2720,
       publisher = {[B. dr.]},
          number = {272},
           title = {O dobywaniu Agru i o pora{\.z}ce po jego wzi{\k e}ciu},
         address = {[Krak{\'o}w]},
             url = {http://cbdu.ijppan.pl/id/eprint/2720/}
}