MEHAL, W., WORDSWORTH, B., TAYLOR, C., BELL, J., FLEMING, K., & Chapman, R. (1991). INABILITY TO ATTRIBUTE SUSCEPTIBILITY TO PRIMARY SCLEROSING CHOLANGITIS TO SPECIFIC AMINO-ACID POSITIONS OF THE HLA-DRW52A ALLELE. NEW ENGLAND JOURNAL OF MEDICINE, 325(17), 1252–1252.

MEHAL, W., et al. “INABILITY TO ATTRIBUTE SUSCEPTIBILITY TO PRIMARY SCLEROSING CHOLANGITIS TO SPECIFIC AMINO-ACID POSITIONS OF THE HLA-DRW52A ALLELE.” NEW ENGLAND JOURNAL OF MEDICINE, vol. 325, no. 17, 1991, pp. 1252–52.

MEHAL, W, B WORDSWORTH, C TAYLOR, J BELL, K FLEMING, and R Chapman. 1991. “INABILITY TO ATTRIBUTE SUSCEPTIBILITY TO PRIMARY SCLEROSING CHOLANGITIS TO SPECIFIC AMINO-ACID POSITIONS OF THE HLA-DRW52A ALLELE.” NEW ENGLAND JOURNAL OF MEDICINE 325 (17): 1252–52.