@article{VMJ_2008_10_4_a5,
     author = {S. S. Kutateladze},
     title = {Nonstandard models and optimization},
     journal = {Vladikavkazskij matemati\v{c}eskij \v{z}urnal},
     pages = {39--48},
     publisher = {mathdoc},
     volume = {10},
     number = {4},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/VMJ_2008_10_4_a5/}
}