@inproceedings{SAC-1994-FlorianiM,
	author        = "Leila De Floriani and Paola Magillo",
	booktitle     = "{Proceedings of the Ninth Symposium on Applied Computing}",
	doi           = "10.1145/326619.326766",
	pages         = "318--322",
	publisher     = "{ACM}",
	title         = "{Computing point visibility on a terrain based on a nested horizon structure}",
	year          = 1994,
}