Having studied the 20th century revolutionary processes, Andrey Korotayev (HSE), Leonid Grinin (HSE) and Anton Grinin (MSU) have put together an extensive evidence base, proposed a new typology of revolutions and revolutionary waves, and introduced the concept of 'analogues of revolutions'. Their study '20th Century Revolutions: Characteristics, Types, and Waves' is the follow-up to an earlier paper published in Russian. The new findings are presented in
Humanities & Social Sciences Communications.