Reconstructing population history using JC virus: Amerinds, Spanish, and Africans in the ancestry of modern Puerto Ricans.
Fernandez-Cobo M, Jobes DV, Yanagihara R, Nerurkar VR, Yamamura Y, Ryschkewitsch CF, Stoner GL. Reconstructing population history using JC virus: Amerinds, Spanish, and Africans in the ancestry of modern Puerto Ricans. Hum Biol. 2001 Jun; 73(3):385-402.