http://www.rfc-editor.org/rfc/rfc3194.txt
RFC 3194: The H-Density Ratio for Address Assignment Efficiency An Update on the H ratio, A. Durand, C. Huitema2001-11-01T23:00:00-00:00This document provides an update on the "H ratio" defined in RFC 1715. It defines a new ratio which the authors claim is easier to understand. This memo provides information for the Internet community.