Collectanea Mathematica (electronic version): http://www.mat.ub.es/CM

    

    

      

   

          

    

       

            

         

         

          

       

    

     



Collectanea Mathematica (electronic version): http://www.mat.ub.es/CM



         



 

         



   

         



         







         









         



         



          

           



            

    

           

         

 