Mobile information technologies of user navigation in buildings Journal title: Vìsnik Nacìonalʹnogo unìversitetu "Lʹvìvsʹka polìtehnìka". Serìâ Ìnformacìjnì sistemi ta merežì Authors: Volodymyr Pasichnyk, Valeriya Savchuk, Olga Yegorova Subject(s):