Studies Recommending HCG w/ TRT?

Does anyone have links to studies recommending the use of hcg with trt? My endo is unwilling to prescribe it for me and he says if I can come up with some studies that do so, he would be willing to.

Thanks for any help or ideas.

Those are hard to find, but I just spent five minutes on google with “use of hcg with trt medical” and came across these two sites first after skipping all of the other bodybuilding links.

Dr John Crisler on HCG for Symptoms of Low Testosterone - this site has a number of other links in it including this one:
http://jcem.endojournals.org/content/90/5/2595.abstract