@article{SMJ2_1996_22_3_a4,
     author = {Ribarska, N. and Tsachev, Ts. and Krastanov, M.},
     title = {Speculating {About} {Mountains}},
     journal = {Serdica Mathematical Journal},
     pages = {341--358},
     publisher = {mathdoc},
     volume = {22},
     number = {3},
     year = {1996},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SMJ2_1996_22_3_a4/}
}