TY - JOUR A1 - Hartmann, G. K. T1 - "Between unmanned and manned space research" Dr. Siegfried J. Bauer for his 80th birthday JO - Hist. Geo Space. Sci. J1 - HGSS VL - 2 IS - 1 SP - 81 EP - 82 Y1 - 2011/06/29 PB - Copernicus Publications SN - 2190-5029 UR - https://hgss.copernicus.org/articles/2/81/2011/ L1 - https://hgss.copernicus.org/articles/2/81/2011/hgss-2-81-2011.pdf DO - 10.5194/hgss-2-81-2011 ER -