ALVARADO, Carlos S. Note on an Early Physiological Index of ESP: John E. Purdon’s Observations of Synchronous Pulse Rates. Journal of Scientific Exploration, [S. l.], v. 29, n. 1, 2015. Disponível em: https://journalofscientificexploration.org/index.php/jse/article/view/823. Acesso em: 30 apr. 2026.