Terry, I will ask my Vet to photocopy the references for me in the medical journals. But, this may take some time as her free time is rather limited. Perhaps she will let me peruse the journals myself looking for the references. Barb Bowes Bo & Chelsea (Pyrs), Flopsy (Pyr Shep) & Machin (Doxie) The more people I meet, the more I like my dog! bamb@monmouth.com