@article{JCEM_2016_3_3_a5,
     author = {P. M. Porvatov and S. M. Elsakov},
     title = {Methods for determining mobile location in zones without {GPS} reception},
     journal = {Journal of computational and engineering mathematics},
     pages = {53--61},
     publisher = {mathdoc},
     volume = {3},
     number = {3},
     year = {2016},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/JCEM_2016_3_3_a5/}
}