?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Casti%2C+J.&rft.aulast=Casti&rft.aufirst=J.&rft.date=September+1984&rft.isbn=978-0566006852&rft.title=On+the+theory+of+models+and+the+modelling+of+natural+phenomena.&rft.btitle=On+the+theory+of+models+and+the+modelling+of+natural+phenomena.&rft.genre=bookitem