Experimental studies of the effect of metal core (silver alloy) on the gingival tissue. 2nd Report : Extensive investigation of gingival discoloration.
5) Harrison, J. D., Rowley, P. S. A. and Peters, P. D. Amalgam tattoo: Light and electron microscopy andelectron-probemicro-analysis, J Path, 121: 83-92, 1977.