Several important papers on Lévy processes are referring to the following paper:
K. Urbanik and WA Woyczynski, A random integral and Orlicz spaces, Bulletin de l'Académie Polonaise des Sciences, Série des sciences mathématiques, astronomiques et physiques, 15 (1967), p. 161-169
I couldn't find this reference in the traditional databases, either on the website of the journal. Is it possible to find it on the internet?