http://iccf15.frascati.enea.it/ICCF15-PRESENTATIONS/S8_O2_Cook.pdf
If you have nothing better to do this weekend, here is a 71 page paper which Rossi says gives a correct explanation of gain with Ni-H. I do not have the time, so the hope is to entice someone else to "chop wood" (Van Morrison fans will appreciate this metaphor) I did a search for 62Ni but nothing turned up. A quick scan shows an unusual emphasis on helium, which has not apparent connection to Rossi. Quien sabe?