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In page Nikolai Bukharin:

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In 1911, after a brief imprisonment, Bukharin was exiled to Onega in Arkhangelsk, but he soon escaped to Hanover. He stayed in Germany for a year before visiting Kraków (Poland) in 1912 to meet Vladimir Lenin for the first time. During the exile, he continued his education and wrote several books that established him as a major Bolshevik theorist. His work Imperialism and World Economy was endorsed by Lenin.[3] He and Lenin also often had hot disputes on theoretical issues, as well as Bukharin's closeness with the European Left and his anti-statist tendencies. Bukharin developed an interest in the works of Austrian Marxists and heterodox Marxist economic theorists, such as Aleksandr Bogdanov, who did not agree with Lenin.[citation needed]