by Glass, G E, Schwartz, B S, Morgan, J M, III, Johnson, D T, Noy, P M, Israel, E
Published in American journal of public health (1971) (01.07.1995)

by Glass, G E, Amerasinghe, F P, Morgan, 3rd, J M, Scott, T W
Published in The American journal of tropical medicine and hygiene (01.11.1994)