Michael G Rosenblum

Directionality of coupling of physiological subsystems: age-related changes of cardiorespiratory interaction during different sleep stages in babies.

Ralf Mrowka, Laura Cimponeriu, Andreas Patzak, 2003, American journal of physiology. Regulatory, integrative and comparative physiology.

Characterizing direction of coupling from experimental observations.

Vladimir Ponomarenko, M. Rosenblum, A. Pikovsky, 2003, Chaos.