@unpublished{   CrowlTapia81,
author          = "Lawrence A. Crowl and Cristian S. Tapia",
title           = "A Study of {VAX-11/780} Programmed {I/O} {CPU} Utilization",
note            = "Denison University, Granville, Ohio, 43023",
month           = may,
year            = 1981 }