243
by Keller, Matthias, Lenz, Daniel, Wojciechowski, Radosław K.
Published 2021
Springer International Publishing

256
by Keller, C., Fluck, E., Novobilsky, V., Schmidbaur, H.
Published 1969
Springer Berlin Heidelberg

257
by Fay, Brad, Larkin, Rick, Pauwels, Koen, Keller, Ed
Published 2019
MIT Sloan Management Review