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@article{FAA_1987_21_4_a0, author = {A. N. Varchenko and I. M. Gel'fand}, title = {Heaviside functions of a configuration of hyperplanes}, journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a}, pages = {1--18}, publisher = {mathdoc}, volume = {21}, number = {4}, year = {1987}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/FAA_1987_21_4_a0/} }
A. N. Varchenko; I. M. Gel'fand. Heaviside functions of a configuration of hyperplanes. Funkcionalʹnyj analiz i ego priloženiâ, Tome 21 (1987) no. 4, pp. 1-18. http://geodesic.mathdoc.fr/item/FAA_1987_21_4_a0/