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Convolutional calculus. Publishing House of the Bulgarian Academy of Sciences. Sofia 1982.
MR 0666547 |
Zbl 0517.44012
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Some equivalent form of a linear difference equation of the second order of variable coefficients obtained on the basis of operational calculus. Zeszyty Naukowe PG w Gdaňsku. Matematyka XIII (1985), 159-164.
Zbl 0617.39002
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MR 1077056