Angle Modulation Limits of a Noise-Free Phase Lock Loop. - Floyd M. Gardner; John F. Heck (IEEE Trans. Commun., 1978)

Phaselock Loop Cycle Slipping Caused by Excessive Angle Modulation. - Floyd M. Gardner; John F. Heck (IEEE Trans. Commun., 1978)

An analytics engine architecture for service provider deployments. - Ramachendra P. Batni; John F. Heck (Bell Labs Tech. J., 2008)