The People's Republic of Kampuchea, 1979-1989: The Revolution After Pol Pot - Margaret Slocomb - Google Books

https://books.google.de/books?id=l7q6AAAAIAAJ&dq=%22pen%2Bsovann%22

When the Khmer Rouge troops entered Phnom Penh on 17th April 1975, it seemed that the Cambodian revolution had been secured. During the following four years, Cambodian society was dramatically transformed at great cost in terms of human misery and death.…