by Sifrony, S., Sharir, M.
Published in Algorithmica (01.11.1987)

by Matousek, J., Miller, N., Pach, J., Sharir, M., Sifrony, S., Welzl, E.
Published in [1991] Proceedings 32nd Annual Symposium of Foundations of Computer Science (1991)

by MATOUSEK, J, PACH, J, SHARIR, M, SIFRONY, S, WELZL, E
Published in SIAM journal on computing (01.02.1994)

by Pollack, R., Sharir, M., Sifrony, S.
Published in Discrete & computational geometry (1988)