A Simple Mode of Facsimile Using Internet Mail. - Kiyoshi Toyoda; Hiroyuki Ohno; Jun Murai; Dan Wing (RFC, 1998)

Internet facsimile as an Internet office appliance. - Kiyoshi Toyoda; Shiro Tamoto; David H. Crocker (IEEE Commun. Mag., 2001)

SMTP and MIME Extensions for Content Conversion. - Kiyoshi Toyoda; Dave Crocker (RFC, 2005)

Facsimile Using Internet Mail (IFAX) Service of ENUM. - Kiyoshi Toyoda; Dave Crocker (RFC, 2005)