Adawe, A., and Oberg,, C. (2013) Skin-Lightening Practices and Mercury Exposure in the Somali Community Minnesota Medicine July, 2013: 48-49: Access PDF of article
Christopher Charles' page on academia.edu, from where papers can be downloaded. Charles is a social psychologist who writes among other things, on skin lightening practices in Jamaica.
Yaba Blay's academia.edu page. Blay has edited special journal issues on skin lightening as well as a number of articles relating especially to West Africa.