00514naa#a2200169#i#450# EN\\bibl\113100 20260119020709.1 2311-1402 20110925b2011####ek#y0engy0150####ca RUS RU Differentiated approach to the geografic information systems teaching Journal article Nizhnevartovsk Nizhnevartovsk State University 2011 5 с. Journal article local Sliva Ekaterina Alexandrovna vestnik.nvsu.ru