@article{IVM_2005_3_a4,
     author = {V. A. Kolmykov},
     title = {Positivity properties of {Cartan{\textendash}Tits} and {Kac{\textendash}Moody} forms},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {37--40},
     year = {2005},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2005_3_a4/}
}