Parker, L.A., Sullivan, S., Krueger, C. & Mueller, M. Association of timing of initiation of breastmilk expression on milk volume and timing of lactogenesis stage II among mothers of very low - birth - weight infants. (medela.com)
Impact of breastpumping on lactogenesis stage II after cesarean delivery: A randomized clinical trial. (medela.com)
This maintenance stage of milk production is also called Lactogenesis III. (kellymom.com)