Cospectra of joint spectra of a sequence ofstructures, 4th Panhellenic Logic Symposium (Thessaloniki, Greece),2003, 175-179.
with I. N.Soskov, Effective enumerations ofabstract structures, Heyting'88 (New York) (P. Petkov, ed.), Plenum Press, 1990,pp.361--372.
with I. N. Soskov, Admissibility in\Sigma^0_n enumerations, Ann. Univ. Sofia , 90, 1999, 77 - 90.
with St. K. Nikolova, Programming theory inproblems, SofTeX, Sofia 1997.
with I. N. Soskov, Cospectra of joint spectraof structures, Ann. Sofia Univ, Fac. Math and Inf., 96, 2003, 35-44.
Minimal Pairs andQuasi-minimal degrees for the Joint Spectra of Structures. New Computational Pradigms(S. B. Cooper; B. Loewe, eds.) Lecture Notes in Comp. Sci , 3526, 2005, Springer-Verlag, 451--460.
Properties of the Joint Spectra ofsequence of structures, PLS5, Athens,2005
Minimal Pairs and Quasi-Minimal degrees forJoint Spectra, LC2005, Athens.
Kliment lecture ,2005 ,Computability andDegree Spectra of Structures.
Properties ofCo-spectra of joint spectra of structures. Ann. Sofia Univ., Fac. Math. and Inf. , 97, 2005, 15--32.
RelativizedDeggree Spectra. Logical Approaches to Computational barriers (A. Beckmann; U.Berger; B. Loewe; J. Tucker eds.),CiE2006, Swansea,Lecture Notes in Comp. Sci , 3988, 2006,Springer-Verlag, 546--555.
Relativized Degree Spectra, Journal of Logic and Computation, 17, 2007, Oxford Journals, 1215-1233
A Jump Inversion Theorem for the Degree Spectra, CiE 2007, S.B. Cooper, B. L¨owe, and A. Sorbi (Eds.), LNCS 4497, 2007, Springer-Verlag, 716–726
with I. N. Soskov, Jump spectra of abstract structures, PLS6, Volos,2007
Omega-Degree Spectra, Logic and Theory of Algorithms, CiE 2008, Athens, A Beckmann, C Dimitracopoulos, B Löwe (Eds.), LNCS, 5028, 2008, Springer-Verlag
with St. K. Nikolova, Semantics of the programming languages, Softex, 2008
with I. N. Soskov, Some applications of the Jump Inversion theorem, Proceedings of the 7th Panhellenic Logic Symposium, C. Drossos, P. Peppas, C. Tsinakis, (Eds.) 2009, 157-161
with I. N. Soskov, A jump inversion theorem for the degree spectra, Journal of Logic and Computation, vol. 9 , 2009, 199-215
with I.N. Soskov, Effective reducibilities and Degree spectra of Abstract structures, Proceedins of First International İstanbul Graduate Summer School in Logic Modal logic and Its Applications, 2011, ILLC publications accepted
with I. N. Soskov, Enumeration Degree Spectra of Abstract Structures, ТProceedings of the Conference "120 years FMI, SU", R. Levy (Eds), 2012
with I. N. Soskov, Quasi-minimal degrees for degree spectra, Journal of Logic and Computation, 2013, 23 (6) doi: 10.1093/logcom/ext045, 1319-1334