H. Fredericks
发表
W. Collins,
M. Warren,
J. Skinner,
1968,
Bulletin of the World Health Organization.
S. Sivanandam,
H. Fredericks,
1966,
The Medical journal of Malaya.
M. M. Wong,
C. P. Ramachandran,
H. Fredericks,
1969,
Bulletin of the World Health Organization.
Y. L. Fong.,
R. Andre,
F. Cadigan,
1972,
Transactions of the Royal Society of Tropical Medicine and Hygiene.