PRZALA, J. et al. Large luteal cells are the source of immunoreactive beta-endorphine in the pig: effects of HCG and TNFA on its secretion by luteal cells in vitro. In Endocrine regulations. ISSN 1210-0668. ISSN 1336-0329, 1999, roč. 33, č. 3, s. 117-123.