Computing the First Betti Number of a Semi-Algebraic Set.

Saugata Basu Richard Pollack Marie-Françoise Roy Computing the First Betti Number of a Semi-Algebraic Set. 97-136 2008 8 Foundations of Computational Mathematics 1 http://dx.doi.org/10.1007/s10208-007-9001-1 db/journals/focm/focm8.html#BasuPR08