Standish L. J. et al. Evidence of correlated functional magnetic resonance imaging signals between distant human brains // Alternative therapies in health and medicine. 2003. № 9 (1). P. 128, 122–125; Richards T. et al. Replicable functional magnetic resonance imaging evidence of correlated brain signals between physically and sensory isolated subjects //Journal of alternative and complementary medicine. 2005. № 11 (6). P. 955–963.