By Mia Shanley and Helena Soderpalm STOCKHOLM (Reuters) – Painful memories of the Internet bubble bursting more than a decade ago are likely to cut the risk that tech stocks get too frothy, as newcomers Zalando and Rocket Internet prepare to make market debuts, the head of Sweden’s Kinnevik said. The company is the biggest investor in German online fashion retailer Zalando and has an 18.5 percent stake in venture capital company Rocket Internet, which has ambitions to be the largest Internet business outside the United States and China. …

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