@Article{isprs-archives-XLII-2-W13-1615-2019,
AUTHOR = {Yilma, A. D.},
TITLE = {VOLUNTEER GEOGRAPHIC INFORMATION IN AFRICA},
JOURNAL = {The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences},
VOLUME = {XLII-2/W13},
YEAR = {2019},
PAGES = {1615--1620},
URL = {https://isprs-archives.copernicus.org/articles/XLII-2-W13/1615/2019/},
DOI = {10.5194/isprs-archives-XLII-2-W13-1615-2019}
}