共 4 条
[1]
AMOLO MO, 1984, E AFR MED J, V61, P208
[2]
GUPTA M, 1980, B WORLD HEALTH ORGAN, V58, P913
[3]
OSISANYA JOS, 1984, E AFR MED J, V60, P616
[4]
WOOD CS, 1972, NATURE, V229, P165