p00025
Ludwig
Wittgenstein
p00005
Heinz
von
Foerster
p00005->p00025
p00016
Paul
Watzlawick
p00005->p00016
p00019
Ernst
von
Glasersfeld
p00005->p00019
p00016->p00025
p00016->p00005
p00016->p00019
p00232
Peter
Baumgartner
p00232->p00025
p00232->p00005
p00232->p00016
p00232->p00019
p00019->p00025
p00019->p00005
p00019->p00016