00509naa#a2200169#i#450# EN\\bibl\37279 20240426005706.5 2500-3372 20200423b2020####ek#y0engy0150####ca RU Strategic Directions of B2B Sales Development in Modern Economy Journal article Kemerovo Kemerovo State University 2020 10 с. Journal article local Brezhneva Valeria M. Petruchina Vera V. vestnik-pses.kemsu.ru