This 224 page book in Russian language is easy to read with the Google translate app. It was published in 1981. It covers the Czech Benoni, modern Benoni, Benoni without c4, and delayed modern Benoni variations. Although somewhat dated, it is perfectly adequate for players under 2200 ELO. This is particularly true as more recent books usually cover only the modern Benoni and ignore the other variations. I paid about eight dollars for this book many years ago.