On conformal geometry of almost contact manifolds with B-metric (Author's Abstract in Bulgarian of Dissertation for Doctor in Mathematics, defended on 27.10.1998, VAK, Sofia, Bulgaria)
On Geometry of Manifolds with Some Tensor Structures and Metrics of Norden Type (Dissertation for Doctor of Sciences in Mathematics, defended on 15.06.2017 in Plovdiv University, Bulgaria)
On Geometry of Manifolds with Some Tensor Structures and Metrics of Norden Type (Author's Abstract in Bulgarian of Dissertation for Doctor of Sciences in Mathematics, defended on 15.06.2017 in Plovdiv University, Bulgaria)
