White, N. ., Bonner, P. ., Nelson, D. ., & Hauschka, S. . (1975). Clonal analysis of vertebrate myogenesis. IV. Medium-dependent classification of colony-forming cells. Developmental Biology, 44(2), 346-61. Retrieved from http://linkinghub.elsevier.com/retrieve/pii/0012-1606(75)90405-4 (Original work published 1975)