It is on wikipedia with a link to the source. Is that not enough?
I'm skeptical of information, but you have to set the bar the same for both sides. Do you think that the Newsweek article is enough evidence that this theory was important to the science in the 1970s?
In any case, my point is the theory had considerabily more credibility than UFOs or crystal power. It may have been disputed but it was real.