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- [14] 1929, J HYG, V29, P82
- [15] 1922, J INFECT DIS, V31, P209
- [16] 1910, ARCH KINDERH, V54, P307
- [17] 1924, Z GES EXPER MED, V41, P637
- [18] 1921, PEDIATRIA, V29, P97