Walker, A. M., Opferkuch, K., Roos Lindgreen, E., Raggi, A., Simboli, A., Vermeulen, W. J., Caeiro, S., & Salomone, R. (2021). What Is the Relation between Circular Economy and Sustainability? Answers from Frontrunner Companies Engaged with Circular Economy Practices. Circular Economy and Sustainability, https://doi.org/10.1007/s43615-021-00064-7