"Freedom as contemplation or action ? A reply to Arne Naess", in Spinoza's philosophy of man. Proceedings of the Scandinavian Spinoza Symposium, 1977, edited by Jon Wetlesen, Universitetsforlaget, Oslo/Bergen/Tromsø (distributed by Global Book Resources Ltd), 1978, p. 204-210. (anglais).
"Recherches récentes sur Spinoza en Norvège", in Cahiers Spinoza n°2 (printemps 1978), Éditions Réplique, Paris, p. 315-318.
The Sage and the Way (Spinoza's ethics of freedom), Van Gorcum, Assen, 1979, 459 p. (anglais). N II, 16-17.