@article{MZM_2018_103_4_a3,
     author = {V. P. Zastavnyi and A. Manov},
     title = {Positive {Definiteness} of {Complex} {Piecewise} {Linear} {Functions} and {Some} of {Its} {Applications}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {519--535},
     publisher = {mathdoc},
     volume = {103},
     number = {4},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2018_103_4_a3/}
}