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gemelenА то не сразу нашел ключевые слова для нахождения в гуголе:
http://www.nytimes.com/2012/02/19/magazine/shopping-habits.html?_r=1
http://www.forbes.com/sites/kashmirhill/2012/02/16/how-target-figured-out-a-teen-girl-was-pregnant-before-her-father-did/
http://www.nytimes.com/2012/02/19/magazine/shopping-habits.html?_r=1
http://www.forbes.com/sites/kashmirhill/2012/02/16/how-target-figured-out-a-teen-girl-was-pregnant-before-her-father-did/