@book{cbdu6120,
       publisher = {[B. dr.]},
          number = {612},
           title = {Relaci{\'o}n verdadera de las vitorias del sen?or Juan Casimiro, rey de Polonia, contro lasde Carlos X Gustavo, rey de Suecia},
         address = {Madrid},
             url = {http://cbdu.ijppan.pl/id/eprint/6120/}
}