Konstantin Mischaikow Marian Mrozek Pawel Pilarczyk Graph Approach to the Computation of the Homology of Continuous Maps. 199-229 2005 5 Foundations of Computational Mathematics 2 http://dx.doi.org/10.1007/s10208-004-0125-2 db/journals/focm/focm5.html#MischaikowMP05