Juliani, C.M.C.M. and Ciampone, M.H.T. 1999. Counter-reference and reference system organization in the health system context: nurses’ perception. Revista da Escola de Enfermagem da USP. 33, 4 (Dec. 1999), 323–333. DOI:https://doi.org/10.1590/S0080-62341999000400001.