00501naa#a2200169#i#450# EN\INFRA-M\bibl\9377 20241122112248.5 1998-0701 20151117b2015####ek#y0engy0150####ca RUS RU Linear Approximation of Costs As the Basis of Planning Company’s Activity Journal article Moscow INFRA-M Academic Publishing LLC. 2015 5 с. Journal article local Mashinistova G. E. zh-szf.ru