For I can use Google and I like to link to the things I find, like the disco-era paper, "New Maps of Science Fiction" by William Sims Bainbridge and Murray M. Dalziel:
It is strange that science fiction literary criticism is entirely unscientific. Anybody can read a book and give a personal opinion on it. A few readers write intelligent book reviews for magazines like Analog. The best of them bring great writing skill and considerable experience in SF to their job, but none use science. We do.