共 20 条
[1]
BEUCHNER HA, 1975, INT J OCCUP HLTH, V44, P22
[3]
BURROWS B, 1961, AM REV RESPIR DIS, V84, P789
[4]
CHANYEUNG M, 1973, AM REV RESPIR DIS, V108, P1094
[5]
DAVIES RJ, 1979, BRIT J HOSP MED, V22, P136
[8]
GRIMBY G, 1963, ACTA MED SCAND, V173, P199