Natural tracking control for exponential tracking: Lateral high-gain pi control of an aircraft system with state-space description. - William Pratt Mounfield Jr.; Ljubomir T. Grujic (Neural Parallel Sci. Comput., 1993)

Constrained natural tracking control algorithms for bilinear DC shunt wound motors. - Lyubomir T. Gruyitch; William Pratt Mounfield Jr. (CDC, 2001)

Elementwise stablewise tracking with finite reachability time: Linear time-invariant continuous-time MIMO systems. - Lyubomir T. Gruyitch; William Pratt Mounfield Jr. (Int. J. Syst. Sci., 2002)

Stablewise absolute output natural tracking control with finite reachability time: MIMO Lurie systems. - Lyubomir T. Gruyitch; William Pratt Mounfield Jr. (Math. Comput. Simul., 2008)