@article{article110c1387,
title   = {Quantitative determination and sampling of azathioprine residues for cleaning validation in production area},
author = {Fázio, Tatiana Tatit de and Singh, Anil Kumar and Kedor-Hackmann, Erika Rosa Maria and Santoro, Maria Inês Rocha Miritello},
year = {2007},
doi = {10.1016/j.jpba.2006.10.016},
journal   = {Journal of Pharmaceutical and Biomedical Analysis}
}