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 MiAaHDL
digitized 2010 HathiTrust Digital Library committed to preserve pda MiAaHDL
Vol. 18, numbers 1 (Apr. 1997); title from PDF running title (ACM Digital Library, viewed Aug. 9, 2011)
V. 25, numbers 2 (Feb. 2005) (viewed Aug. 9, 2011)