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2. A. V. Skorokhod, Random Processes with Independent Increments [in Russian], Nauka, Moscow (1964).
3. V. S. Korolyuk, Boundary-Value Problems for Compound Poisson Processes [in Russian], Naukova Dumka, Kiev (1975).
4. V. S. Korolyuk, N. S. Bratiichuk, and B. Pirdzhanov, Boundary-Value Problems for Random Walks [in Russian], Ylym, Ashkhabad (1987).
5. N. S. Bratiichuk and D. V. Gusak, Boundary-Value Problems for Processes with Independent Increments [in Russian], Naukova Dumka, Kiev (1990).