Geoffrey Moore «Crossing the Chasm, Marketing and Selling High-Tech Products to Mainstream Customers» (New York: HarperBusiness, 1991)
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Weixin Zha and Stefan Nicola «German Solar Records May Keep Traders Busy on Weekends», Bloomberg, April 15, 2015: bloomberg.com/news/articles/2015–04–15/german-power-grid-expects-a-season-of-record-solar-output
