00523naa#a2200169#i#450# EN\\bibl\113106 20260118093547.7 2311-1402 20110925b2011####ek#y0engy0150####ca RUS RU Optimization of mass service system model by the example of test record system Journal article Nizhnevartovsk Nizhnevartovsk State University 2011 2 с. Journal article local Fatkhinurov Ayrat Rinatovich vestnik.nvsu.ru