@article{IM_1975__29_142327,
     author = {Kenneth S. Brown},
     title = {Euler {Characteristics} of {Groups:} {The} {p-Fractional} {Part.}},
     journal = {Inventiones mathematicae},
     pages = {1--6},
     publisher = {mathdoc},
     volume = {29},
     year = {1975},
     zbl = {0294.20048},
     url = {http://geodesic.mathdoc.fr/item/IM_1975__29_142327/}
}