1. Maximum of the solar cosmic rays during the 22nd solar cycle;Avdyushin;Izvestiya Rossiyskoy Akademii Nauk, Seriya fizicheskaya,1991
2. Badhwar, G.D., Atwell, G.D., Cash, B., Petrov, V.M., Akatov, YuA, Tchernykh, I.V., Shurshakov, V.A., Arkhangelsky, V.V., 1996. Radiation environment on the MIR orbital station during solar minimum
3. Space radiation dosimetry with active detectors for the scientific program of the second Bulgarian cosmonaut on board of Mir space station;Dachev;Adv. Space Res.,1989
4. Detailed study of the SPE and their effects on the dose rate and flux distribution observed by Liulin instrument on MIR space station;Dachev;Radiat. Meas.,1997
5. Description, analysis and impact of major solar activity during recent U.S. shuttle missions;Golightly;Adv. Space Res.,1992