Skordev D. <br/><br/>
Mathematical Logic. Proceedings of the Conference on Mathematical Logic dedicated to the memory of A.A. Markov (1903-1979). Sofia, September 22-23, 1980. 
Skordev D., ed. 
 - Sofia  Publ. House Bulg. Acad. of Sci.  1984 
 - 172 p. 
<br/><br/> Bulgarian Academy of Sciences Centre for Maths and Mechanics 
<br/><br/><label>Dewey Class. No.: </label>51:061.2/3+510