AudioFile: A Network-Transparent System for Distributed Audio Applications. - Jim Gettys; Thoms M. Levergood; Andrew C. Payne; Lawrence C. Stewart; G. Winfield Treese (USENIX Summer, 1993)

Payment for Open Networks. - David K. Gifford; Lawrence C. Stewart; Andrew C. Payne; G. Winfield Treese (COMPCON, 1995)

Payment Switches for Open Networks. - David K. Gifford; Lawrence C. Stewart; Andrew C. Payne; G. Winfield Treese (USENIX Workshop on Electronic Commerce, 1995)