@inproceedings{luc-99-orat-ab,
  author = {Andrzej {\L}ukaszewski},
  title = {Offsets of Rational Surfaces and Ray Tracing},
  booktitle = {Abstracts of the 4th International AFA Conference on Curves and Surfaces},
  location = {Saint-Malo, France},
  pages = {50--51},
  year = 1999,
  month = jun
}