V A Protopopescu

Detecting dynamical changes in time series using the permutation entropy.

L M Hively, Yinhe Cao, Wen-Wen Tung, 2004, Physical review. E, Statistical, nonlinear, and soft matter physics.

Machine failure forewarning via phase-space dissimilarity measures.

L M Hively, V A Protopopescu, V. Protopopescu, 2004, Chaos.