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In 1961 he began his graduate study with Professor I.A. Charny , and in 1965 he successfully defended his dissertation thesis “ Non - stationary problems of the non-linear filtration ” , earning the title of “ Candidate of Science " ( roughly equivalent to PhD ) .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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