Researchr is a web site for finding, collecting, sharing, and reviewing scientific publications, for researchers by researchers.
Sign up for an account to create a profile with publication list, tag and review your related work, and share bibliographies with your co-authors.
Wendy MacCaull. Positive Definite Functions over Regular f-Rings and Representations as Sums of Squares. Annals of Pure and Applied Logic, 44(3):243-257, 1989.
Abstract is missing.