@article{CRMATH_2005__340_12_867_0,
     author = {Kozlov, Dmitry N.},
     title = {Discrete {Morse} theory for free chain complexes},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {867--872},
     publisher = {Elsevier},
     volume = {340},
     number = {12},
     year = {2005},
     doi = {10.1016/j.crma.2005.04.036},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2005.04.036/}
}