http://mek.oszk.hu/03600/03630/html/s/s23293.htm
http://mek.oszk.hu/02200/02228/html/02/23.html
http://books.google.sk/books?id=o7pUAAAAcAAJ&printsec=frontcover&dq=inauthor:%22Matthias+Bernegger%22&hl=hu&sa=X&ei=B1i6U6XYMYPG0QXVpoCoBw&ved=0CE8Q6AEwBjgK#v=onepage&q&f=false
http://epa.oszk.hu/00000/00001/00158/pdf/ITK_EPA00001_1936_01_096-100.pdf
