G. Wittstock, Ein operatorwertiger Hahn-Banach Satz, J. Funct. Anal. 40 (1981) 127-150. University of Mew Hampshire E-mail address: don@unh.edu Current address: Columbia College Chicago E-mail address: wli@colum.eduEin operatorwertiger Hahn-Banach Satz. Gerd Wittstock. Journal of ...