Sustainable business model adoption among S&P 500 firms: A longitudinal content analysis study | 2018 Publication type A1 Journal article (refereed), original research Author(s) Ritala Paavo, Huotari Pontus, Bocken Nancy, Albareda Laura, Puumalainen Kaisu Strategy and Management Renewable Energy, Sustainability and the Environment Business, Management and Accounting (miscellaneous) LUT Business School