@article{PA_2018_7_1_a4,
     author = {Edward Neuman},
     title = {Generalized {Gudermannian} function},
     journal = {Problemy analiza},
     pages = {70--86},
     publisher = {mathdoc},
     volume = {7},
     number = {1},
     year = {2018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PA_2018_7_1_a4/}
}