Two issues constitute a vol.; 2 v. published each year.
Electronic reproduction. [S.l.] : HathiTrust Digital Library, 2010.
Master and use copy. Digital master created according to Benchmark for Faithful Digital Reproductions of Monographs and Serials, Version 1. Digital Library Federation, December 2002. http://purl.oclc.org/DLF/benchrepro0212
Issued by: The Juliusz Schauder Center for Nonlinear Studies.
Description based on: Vol. 5, no. 1 (Mar. 1995); title from table of contents page (Project Euclid, viewed April 19, 2017).