López Penza, P., M. Odriozola, and L. Ruso. “Spontaneous Pneumomediastinum As a Complication of Inhalant Drug Use”. Revista Médica Del Uruguay, Vol. 23, no. 4, Dec. 2007, pp. 260-4, http://www2.rmu.org.uy/ojsrmu311/index.php/rmu/article/view/602.