Active development of the investigation started in the 1970-s. The results obtained within Stage 1
were under study, some new directions appeared. Mechanisms of SHS product formation were realized.
Favorable 70-S: Investigation Branching, 40 YEARS OF SHS: A LUCKY STAR OF A SCIENTIFIC DISCOVERY A Presentation with Elements of a Scientific Lecture (2012) 1: 8. https://doi.org/10.2174/978160805128111201010008