M. Gray

Classification as an Impediment to Reliable and Valid Use of Spatial Information: A Disaggregate Approach

M. Violet Gray, M. Gray, M. Violet Gray, 1997, COSIT.

Miscommunicating With Isoline Preference Maps: Design Principles for Thematic Maps

Daniel R. Montello, M. Violet Gray, D. R. Montello, 2005 .