@article{Clark1995,
author = {Clark, S.  and Colson, E.},
title= {en thousand Tonga: a longitudinal anthropological study from southern Zambia, 1956–1991},
year = {1995},
doi = {10.1080/0032472031000148266},
journal = {Population Studies},
volume = {49},
number = {1},
pages = {91--109},
}