Hunyadi, J, M Simon, and A Dobozy. 1989. “Cryopreserved 3T3 Fibroblasts Retain Their Capacity to Enhance the Growth of Human Keratinocyte Cultures”. Acta Dermato-Venereologica 69 (6):509-12. https://doi.org/10.2340/0001555569509512.