Research of activity of cataclysmic variables, supersoft X-ray sources and
other binary high energy sources including the prototypic source HZ Her/Her X-1,
with the impact for the development and specification of their physical models,
deeper understanding of the physical processes controlling the activity of these
objects and their physical evolution. These analyses often made use of suitably
applied archival optical and X-ray data for investigation of the physical
behaviour of selected sources on various time scales, including unique analyses
of activity of systems on the time scales of the order of several decades.
This led to a deeper understanding of the physical processes which act on such
long time intervals. Also the CCD data obtained by our instruments in the
Astronomical Institute were utilized, including the international observing
campaigns. All this gave rise to a series of publications and scientific
communications.
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