@Article{hgss-2-81-2011,
AUTHOR = {Hartmann, G. K.},
TITLE = {"Between unmanned and manned space research" Dr. Siegfried J. Bauer for his 80th birthday},
JOURNAL = {History of Geo- and Space Sciences},
VOLUME = {2},
YEAR = {2011},
NUMBER = {1},
PAGES = {81--82},
URL = {http://www.hist-geo-space-sci.net/2/81/2011/},
DOI = {10.5194/hgss-2-81-2011}
}