On conditions for R[?,?-1] to be exclusive and contractions of principal ideals of R[?]∪R[?-1]
C. R. Math. Rep. Acad. Sci. Canada Vol. 21 (2) 1999, pp. 39–45
June 1, 1999
S. Oda / K. Yoshida
No abstract available but the full text is online at the title link above.