@article{RO_2012__46_2_149_0,
     author = {Keykhaei, Reza and Jahandideh, Mohamad Taghi},
     title = {Tangency portfolios in the {LP} solvable portfolio selection models},
     journal = {RAIRO - Operations Research - Recherche Op\'erationnelle},
     pages = {149--158},
     publisher = {EDP-Sciences},
     volume = {46},
     number = {2},
     year = {2012},
     doi = {10.1051/ro/2012012},
     zbl = {1248.90062},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1051/ro/2012012/}
}