@article{ZNSL_1998_254_a4,
     author = {V. N. Dubinin and L. V. Kovalev},
     title = {The reduced modulus of the complex sphere},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {76--94},
     publisher = {mathdoc},
     volume = {254},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1998_254_a4/}
}