Mircea Radu
Otto Hölder's 1892 "review of Robert Graßmann's 1891 theory of number". introductory note
2013
Philosophia Scientiae 17/1
Otto Hölder's interpretation of David Hilbert's axiomatic method
2013
Philosophia Scientiae 17/1
Did Hermann and Robert Graßmann contribute to the emergence of formal axiomatics?
2005
in: Activity and sign, Dordrecht : Springer