Use of the Internet as a subnetwork for experimentation with the OSI network layer. - Robert A. Hagens; Nancy E. Hall; Marshall T. Rose (RFC, 1989)

Echo function for ISO 8473. - Robert A. Hagens (RFC, 1990)

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

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

Using the Internet DNS to Distribute RFC1327 Mail Address Mapping Tables. - Claudio Allocchio; Antonio Blasco Bonito; Bruce Cole; Silvia Giordano; Robert A. Hagens (RFC, 1994)