malem agan.. mau minta tolong title : Pigment changes in human skin after cryotherapy author : Burge SM, Bristol M, Millard PR, Dawber RP Cryobiology. 1986 Oct;23(5):422-32 http://www.sciencedirect.com/science/article/pii/0011224086900271?via=ihub terima kasih sebelumnya gan..
