@article{RM_1978_33_1_a20,
     author = {A. M. Vershik},
     title = {The action of $PLS(2, \mathbb Z)$~in~$\mathbb R^1$ is approximable},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {221--222},
     publisher = {mathdoc},
     volume = {33},
     number = {1},
     year = {1978},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1978_33_1_a20/}
}