@Article{616644,
     author = "Piotr Guzowski",
     title = "Demographic conditions of the functioning of peasant families at the turn of the Middle Ages",
     year =  2013,
     volume =  73,
     number =  ,
     journal =  Roczniki Dziejów Społecznych i Gospodarczych,
     pages =  s. 9-28,
    }