Chemical composition and sources of particle pollution in affluent and poor neighborhoods of Accra, Ghana - Zhou, Zheng; Dionisio, Kathie L.; Coull, Brent; Arku, Raphael E.; Koutrakis, Petros; Spengler, John D.; Vallarino, Jose; Hughes, Allison F.; Agyei-Mensah, Samuel; Ezzati, Majid; Veríssimo, Thiago Gomes; Kerr, Américo Adlai Franco Sansigolo (ENVIRONMENTAL RESEARCH LETTERS, 2013)