Linear Algebra and Analytical Geometry
(http://www.fmi-plovdiv.org/bg_ver/edu/laag/)

Differential Geometry

Projective and Descriptive Geometry

Geometry for Computer Science
(http://www.fmi-plovdiv.org/Education/manev/CompGeom/)

Graph Theory
(http://www.fmi-plovdiv.org/Education/manev/Graphs/)