Ashley_1972.pdf 18.1 MB  
  Chapman_1950.pdf 2.2 MB  
  Chilton_1996.pdf 10.1 MB  
  Goldthwait_etal_1951.pdf 8.2 MB  
  Kenyon_1985.pdf 1 MB  
  Petersen_1978.pdf 3.5 MB  
  Pretola_2000.pdf 6.6 MB