O. Vries

Insults Hurt : Verbal Injury in Late Medieval Frisia

R. Bremmer, T. Johnston, O. Vries, 1998 .

Frisonica libertas: Frisian freedom as an instance of medieval liberty

O. Vries, 2015 .

From Modern Frisian to Old Frisian: On Cliticisation of the Definite Article

R. Bremmer, G. V. D. Meer, W. Visser, 1990 .

Aspects of old Frisian philology

R. Bremmer, G. V. D. Meer, O. Vries, 1990 .