PHSColograms and Rotated PHSColograms

@article{San1995_2,
type = {221},
author = {Sandor, Ellen and Fron, Janine and Meyers, Stephan},
title = {PHSColograms and Rotated PHSColograms},
year = {1995},
journal = {Computers & Graphics},
pages = {513-522},
number = {4},
bibtex = {},
volume = {19},
month = {July/August},
}