@article{RM_2006_61_6_a5,
     author = {M. Farber and D. Sch\"utz},
     title = {Novikov--Betti numbers and the fundamental group},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {1173--1175},
     publisher = {mathdoc},
     volume = {61},
     number = {6},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2006_61_6_a5/}
}