https://www.proz.com/personal-glossaries/entry/25685249-%D0%B2%D1%8B%D0%B1%D0%BE%D1%80%D0%BA%D0%B0-%D1%81%D1%82%D1%83%D0%BF%D0%B5%D0%BD%D1%87%D0%B0%D1%82%D0%B0%D1%8F-%D0%BA%D0%BE%D0%BC%D0%B1%D0%B8%D0%BD%D0%B8%D1%80%D0%BE%D0%B2%D0%B0%D0%BD%D0%BD%D0%B0%D1%8F-mixed-multistage-sampling?phpv_redirected=1&phpv_redirected=2