The 2 references without contexts in paper Lyubov Ruchinskaya V., Любовь Ручинская Валерьевна (2016) “МНОГОМЕРНЫЙ СТАТИСТИЧЕСКИЙ АНАЛИЗ ПОТРЕБИТЕЛЬСКИХ ПРЕДПОЧТЕНИЙ НА РЫНКЕ КИСЛОМОЛОЧНОЙ ПРОДУКЦИИ // MULTIVARIATE STATISTICAL ANALYSIS OF CONSUMERS’ PREFERENCE AT THE RUSSIAN MARKET OF CULTURED MILK PRODUCT” / spz:neicon:statecon:y:2013:i:4:p:159-162

5
Baron Dzh. Effective segmentation. // Marketing and market researches, No. 4 (40), August 2002.
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6
Plyuta V. The modern multidimensional analysis in economic researches. – М: Statistics, 1980.
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