@article{10_2140_agt_2017_17_2051,
     author = {Burghelea, Dan},
     title = {A refinement of {Betti} numbers and homology in the presence of a continuous function, {I}},
     journal = {Algebraic and Geometric Topology},
     pages = {2051--2080},
     year = {2017},
     volume = {17},
     number = {4},
     doi = {10.2140/agt.2017.17.2051},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2017.17.2051/}
}