 Two of its members also produced influential literary works, namely Viktor Shklovsky (1893–1984), whose numerous books (e.g., "Zoo, or Letters Not About Love", 1923) defy genre in that they present a novel mix of narration, autobiography, and aesthetic as well as social commentary, and Yury Tynyanov (1893–1943), who used his knowledge of Russia's literary history to produce a set of historical novels mainly set in the Pushkin era (e.g., "").Writers like those of the Serapion Brothers group (1921– ), who insisted on the right of an author to write independently of political ideology, were forced by authorities to reject their views and accept socialist realist principles.Some 1930s writers, such as Mikhail Bulgakov (1891–1940), author of "The Master and Margarita" (written 1928–1940, published 1966), and Nobel Priz-winning Boris Pasternak (1890–1960) with his novel "Doctor Zhivago" (written 1945–1955, published 1957) continued the classical tradition of Russian literature with little or no hope of being published.