@article{article06f81c1a,
title   = {Heterogeneity of the O Alleles at the blood group ABO locus in amerindians},
author = {Olsson, Martin L and Santos, Sidney E B and Guerreiro, João F and Zago, Marco Antônio and Chester, M Alan},
year = {1998},
journal   = {Vox Sanguinis}
}