Volume 5, Issue 1 & 2, September 1994, Pages 80-92
By: A. Bishop & R. Boissy; Translated by: F. Zohadi
Volume 2, Issue 1, 2, 3, & 4, March 1991, Pages 245-267
By: L. Inkova & U. Osipova; Translated by: F. Zohadi