George E. Collins, Alkiviadis G. Akritas. Polynomial real root isolation using Descarte's rule of signs. In Richard D. Jenks, editor, SYMSAC 1976, Proceedings of the third ACM Symposium on Symbolic and Algebraic Manipulation, Yorktown Heights, New York, USA, August 10-12, 1976. pages 272-275, ACM, 1976. [doi]
Abstract is missing.