@article{KYB_1976_12_3_a1,
     author = {Kramosil, Ivan},
     title = {A selection-based formal description of an environment},
     journal = {Kybernetika},
     pages = {127--150},
     year = {1976},
     volume = {12},
     number = {3},
     mrnumber = {0439294},
     zbl = {0329.94031},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1976_12_3_a1/}
}