共 4 条
[1]
LANGWORTHY OR, 1930, J EXPER MED JUN
[2]
LANGWORTHY ORTHELLO R., 1930, JOUR INDUST HYG, V12, P31
[3]
Spitzka EA, 1912, AM J MED SCI, V144, P341
[4]
URQUHART R. W. IAN, 1927, JOUR INDUSTR HYG, V9, P140