1. About the possible stucture of global model of lower ionosphere for VLF forecast;Azarnin;Probl. Difrakcii Rasprostranenya Voln,1987
2. Observation and numerical simulation of the cycles slipping phenomenon;Boloshin;Probl. Difrakcii Rasprostranenya Voln,1996
3. The field of the point source in irregular anisotropic waveguide;Boolah;Probl. Difrakcii Rasprostranenya Voln,1986