Ranking intervals under visibility constraints
H. Edelsbrunner, M. Overmars, E. Welzl, I. Hartman, J. Feldman, International Journal of Computer Mathematics 34 (1990) 129–144.

A new approach to rectangle intersections part 1
H. Edelsbrunner, International Journal of Computer Mathematics 13 (1983) 209–219.

A new approach to rectangle intersections part 2
H. Edelsbrunner, International Journal of Computer Mathematics 13 (1983) 221–229.