Descripción
Publicado:Began with: 1967.
Frecuencia de Publicación:Every 18 months, 1999-
Formato: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.
Mode of access: World Wide Web.
ISSN:19990103