@article{VSGTU_1999_7_a16,
     author = {V. A. Akulov},
     title = {Two-level nonparametric model and its application in cardiology},
     journal = {Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences},
     pages = {158--162},
     publisher = {mathdoc},
     number = {7},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VSGTU_1999_7_a16/}
}