In his book, the coming of Tan, Riley Martin (1946-2015) describes how he was taken on board of a huge egg-shaped "mothership" in the vicinity of Saturn. On the mothership he learned it was inhabited by seven different species of intelligent technological life forms, of which the Dorians are one. He mentioned that the Dorians looked like blonde-haired, blue-eyed humans.
No other authors mention this species. Many researchers question his credibility.