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It is based on various research papers published in the period 1979-1989, but due to various technical reasons it has been defended much later, in 2007, at the Institute for Nuclear Research and Nuclear Energy of the Bulgarian Academy of Sciences.
This "Doctor of Sciences" thesis supersedes my Ph.D. thesis defended in 1979 under the supervision of Prof. Ludwig Faddeev and Prof. Peter Kulish at the St. Petersburg Department of Steklov Institute of Mathematics of Russian Academy of Sciences, St. Petersburg, Russia, as well as Prof. Irina Aref'eva from the Moscow Branch of Steklov Institute of Mathematics (as a scientific consultant).
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Annual Reports on Research Topic "New Aspects of String Theory and Gravity"
2014 2015
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