@article{01979625, title = {On the upper envelopes of a family of }, journal = {Vladikavkazski\u\i\ Matematicheski\u\i\ Zhurnal}, volume = {3}, year = {2001}, pages = {8-16}, zbl = {1030.47028}, language = {en}, url = {http://dml.mathdoc.fr/item/01979625} }
Radnaev, V.A. On the upper envelopes of a family of . Vladikavkazskiĭ Matematicheskiĭ Zhurnal, Tome 3 (2001) pp. 8-16. http://gdmltest.u-ga.fr/item/01979625/