Gorelchik V.I., Shirokov V.A., Firstov P.P., Chubarova O.S. (1997) Shiveluch volcano: seismicity, deep structure and forecasting eruptions (Kamchatka) // Journal of Volcanology and Geothermal Research. Vol. 78, No. 1–2. pp. 121 - 137. doi: 10.1016/S0377-0273(96)00108-4.

Shirokov V.A. (1989) Estimation of the Mass and Volume of Tephra from Volcanic Eruptions // Volcanology and Seismology. Vol. 7, No. 5. pp. 683-700.

Shirokov V.A. (1989) Some Procedural Aspects of Comprehensive Prediction of Flank Eruptions of Klyuchevskoi Volcano (Kamchatka) // Volcanology and Seismology. Vol. 7, No. 6. pp. 921-942.

Fedotov S.A., Sobolev G.A., Boldyrev S.A., Gusev A.A., Kondratenko A.M., Potapova O.V., Slavina L.B., Theophylaktov V.D., Khramov A.A., Shirokov V.A. (1977) Long- and short-term earthquake prediction in Kamchatka // Tectonophysics. Vol. 37, No. 4. pp. 305-321. doi: 10.1016/0040-1951(77)90054-3.