Ferreira MU, Ribeiro WL, Tonon AP, Kawamoto F, Rich SM.  2003.  Sequence diversity and evolution of the malaria vaccine candidate merozoite surface protein-1 (MSP-1) of Plasmodium falciparum.. Gene. 304:65-75.

Ayala FJ, Rich SM.  2000.  Genetic variation and the recent worldwide expansion of Plasmodium falciparum.. Gene. 261(1):161-70.

Rich SM, Ferreira MU, Ayala FJ.  2000.  The origin of antigenic diversity in Plasmodium falciparum.. Parasitol Today. 16(9):390-6.

Ayala FJ, Escalante AA, Rich SM.  1999.  Evolution of Plasmodium and the recent origin of the world populations of Plasmodium falciparum.. Parassitologia. 41(1-3):55-68.

Rich SM, Ayala FJ.  1998.  The recent origin of allelic variation in antigenic determinants of Plasmodium falciparum.. Genetics. 150(1):515-7.