@Article{gh-30-97-1975,
AUTHOR = {Haefner, H. and Messerli, B.},
TITLE = {Erderkundung aus dem Weltraum : das schweizerische ERTS- und EREP-Satellitenprojekt},
JOURNAL = {Geographica Helvetica},
VOLUME = {30},
YEAR = {1975},
NUMBER = {3},
PAGES = {97--100},
URL = {https://gh.copernicus.org/articles/30/97/1975/},
DOI = {10.5194/gh-30-97-1975}
}