@Book{02208097X,
author="Roman, Steven",
title="umbral calculus",
series="Pure and applied mathematics 111",
year="1984",
publisher="Academic Pr.",
address="Orlando [u.a.]",
keywords="Calculus, operational; Polynomials; Sequences (Mathematics)",
note="Steven Roman",
note="Literaturverz. S. 183 - 187",
isbn="0125943806",
language="English"
}