Birnbaum, PS (May 1985). "Cost containment: freestanding emergency centers and the emergency department". The American Journal of Emergency Medicine. 3 (3): 259. doi:10.1016/0735-6757(85)90105-6. PMID3994805.
Birnbaum, PS (May 1985). "Cost containment: freestanding emergency centers and the emergency department". The American Journal of Emergency Medicine. 3 (3): 259. doi:10.1016/0735-6757(85)90105-6. PMID3994805.