@article{RM_1979_34_2_a0,
     author = {V. I. Arnol'd},
     title = {Indices of singular points of 1-forms on a manifold with boundary, convolution of invariants of reflection groups, and singular projections of smooth surfaces},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {1--42},
     publisher = {mathdoc},
     volume = {34},
     number = {2},
     year = {1979},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1979_34_2_a0/}
}