A few years ago I was doing very indepth research on how the human eye worked. Not from a medical point of view but as a "machine." All research was done on the internet. I quickly became apparent that the vast majority of papers, websites, etc. were just citing each other. An ongoing circle. And unsustantiated claims or descriptions just flowed around the internet with nobody really caring. I'm very sure that people are citing things they have not read. If the paper exists it would be very surprising if you could not find it. You do know what you are doing.