M. T. Toneline, L. Papacidero, R. da S. Torres, S. F. Peron, and M. E. Kalil, “Recurrent pleural effusion as a clinical manifestation of multiple myeloma”, Rev. Fac. Ciênc. Méd. Sorocaba, vol. 15, no. 4, pp. 138–140, Dec. 2013.