@article{PawelkeButzer1968,
  author    = {Pawelke, Siegfried and Butzer, Paul L.},
  title     = {Semi-groups and resolvent operators / Butzer. P. L. ; Pawelke, S.},
  series = {Archive for Rational Mechanics and Analysis. 30 (1968), H. 2},
  journal   = {Archive for Rational Mechanics and Analysis. 30 (1968), H. 2},
  isbn      = {0003-9527},
  pages     = {127 -- 147},
  year      = {1968},
  language  = {en}
}
@article{PawelkeBerensButzer1968,
  author    = {Pawelke, Siegfried and Berens, H. and Butzer, Paul L.},
  title     = {Limitierungsverfahren von Reihen mehrdimensionaler Kugelfunktionen and deren Saturationsverhalten / Berens, H. ; Butzer, Paul L. ; Pawelke, S.},
  series = {Publications of the Research Institute for Mathematical Sciences = Ky\&\#333;to-daigaku-s\&\#363;ri-kaiseki-kenky\&\#363;sho-kiy\&\#333; / Kyoto University. A 4 (1968), H. 2},
  journal   = {Publications of the Research Institute for Mathematical Sciences = Ky\&\#333;to-daigaku-s\&\#363;ri-kaiseki-kenky\&\#363;sho-kiy\&\#333; / Kyoto University. A 4 (1968), H. 2},
  isbn      = {0034-5318},
  pages     = {201 -- 268},
  year      = {1968},
  language  = {de}
}