Persinger M. A. ELF Field meditaion in spontaneous psi events. Direct information transfer or conditioned elicidation? // Psychoenergetic systems. 1975. № 3. P. 155–169; Persinger M. A. Geophysical variables and behavior: XXX. Intense paranormal activities occur during days of quiet global geomagnetic activity // Perceptual motor skills. 1985. № 61. P. 320–322.
