@article{FPM_2019_22_4_a15,
     author = {E. E. Shirshova},
     title = {On convex directed subgroups of pseudo lattice-ordered groups},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {239--252},
     publisher = {mathdoc},
     volume = {22},
     number = {4},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2019_22_4_a15/}
}