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http://steveblank.com/2012/03/05/search-versus-execute/
3. Blank, S.: The Four Steps to the Epiphany. K&S Ranch, Pescadero (2013)
4. Blank, S.: Why the lean start-up changes everything. Harvard Bus. Rev. 91(5), 63–72 (2013)
5. Blank, S., Dorf, B.: The Startup Owner’s Manual. K&S Ranch, Pescadero (2012)