  This is our regular research in the field of cyclic O-C changes and third
components. In this article the results of four new stars investigation is
described. These stars are: BD And, SV Cam, V0836 Cyg and XZ CMi. All of them
have cyclic O-C curve with linear (BD And, SV Cam and XZ CMi) or parabolic
trend (V0836 Cyg). We computed the mass transfer rate, minima possible mass of
the third component and their errors for each of the researched stars.
