Noyade has it.
That is the one.
As magnesium has a density of 1.74, compared with 2.7 for aluminium and almost 8 for typical steels, it seemed reasonable to the MAI management to investigate its use as a primary structural material. In 1932 such a project was authorised by Director A M Belenkovich and the GUAP (civil aviation ministry), and a year later a design team was assembled under Professors S I Zonshain and A L Gimmelfarb, with construction led by N F Chekhonin. A four-seat low-wing monoplane was quickly designed, and flown about 600 times in 1934-39. It was also statically tested at (CAHI) TsAGI. The EMAI was also known as the E-MAI, Elektron MAI, EMAI-1, E-l, EMAI-I-34 and Sergo Ordzhonikidze.
You have Control
Graeme please check PM.