BACH: a hardware monitor for tracing microprocessor-based systems. - Knuth Stener Grimsrud; James K. Archibald; M. Ripley; J. Kelly Flanagan; Brent E. Nelson (Microprocess. Microsystems, 1993)

A dual-frequency GNSS sensor for space applications. - M. Ripley; Jack Cooper; P. Daly; Pierluigi Silvestrin (Int. J. Satell. Commun. Netw., 1998)