@article{IM_1986__84_143344,
     author = {R. MacPherson and K. Vilonen},
     title = {Elementary construction of perverse sheaves.},
     journal = {Inventiones mathematicae},
     pages = {403--436},
     publisher = {mathdoc},
     volume = {84},
     year = {1986},
     zbl = {0597.18005},
     url = {http://geodesic.mathdoc.fr/item/IM_1986__84_143344/}
}