Performance of two 4×4 guided-wave photonic switching systems. - John R. Erickson; Gail A. Bogert; Roger F. Huisman; Ronald A. Spanke (IEEE J. Sel. Areas Commun., 1988)

A Prototype Growable 2.5 Gb/s ATM Switch for Broadband Applications. - Kai Y. Eng; Mark A. Pashan; Ronald A. Spanke; Mark J. Karol; Gary D. Martin; Hitoshi Obara; Hiromi Ueda (J. High Speed Networks, 1992)