New Old Mechanism of Dark Matter Burning

Recently several papers have been published, where "a new mechanism" of dark matter burning and freezing is suggested. The usual two-body annihilation process is generalized to multi-body initial states, mostly three-body. These processes have quite a few interesting cosmological implications. I want to indicate here that such a process was studied in 1980 to determine the cosmological number density of the so called theta-particles. The file of the translated into English original paper and the reference to the published English version are attached.