@Article{467581,
     author = "Małgorzata Kobylińska, Lesław Markowski",
     title = "Estimation of Risk – Return Relation Parameters in the Context of the APT Model",
     year =  2009,
     volume =  4,
     number =  1,
     journal =  Olsztyn Economic Journal,
     pages =  s. 26-38,
    }