@ARTICLE {GREENLAND:1975,
title = {Bringing the green revolution to the shifting cultivator},
author = {Greenland, D. J},
journal = {Science},
year = {1975},
volume = {190},
number = {4217},
pages = {841--844},
issn = {0036-8075},
doi = {10.1126/science.190.4217.841},
}