CERTs in Europe - Joao Nuno Ferreira; Alf Hansen; Tomaz Klobucar; Klaus-Peter Kossakowski; Manuel Medina; Damir Rajnovic; Olaf Schjelderup; Don Stikvoort (Comput. Networks ISDN Syst., 1996)

Operational Requirements for X.400 Management Domains in the GO-MHS Community - Robert A. Hagens; Alf Hansen (RFC, 1994)

The Internet X.400 Pilot Project - C. Allan Cargille; Robert A. Hagens; Alf Hansen; Lawrence H. Landweber (Comput. Networks ISDN Syst., 1991)

Coordination of Mail Gateways: The X.400-RFC Problem - Alf Hansen (Comput. Networks ISDN Syst., 1990)

RARE MHS Project Review - Alf Hansen (Comput. Networks, 1988)