Szu, S.C., et al. “Phase II Trials of Conjugates of <em>S.typhi< em> Vi and of <em>S.paratyphi< Em> A O-Speciftc Polysaccharide (O-SP) Conjugates in Dong Thap Province, Vietnam”. Medical Journal of Indonesia, vol. 7, no. Supp1, Oct. 1998, p. 109, doi:10.13181/mji.v7iSupp1.1052.