Sanchez-Ruiz, L., J. A. Marin-Garcia, and B. Blanco. “Protocol: A Meta-Review on Continuous Improvement to Know the State of This Research Field”. WPOM-Working Papers on Operations Management, vol. 9, no. 2, Dec. 2018, pp. 88-111, doi:10.4995/wpom.v9i2.10752.