• Non-linear analysis of the electro-encephalogram for detecting effects of low-level electromagnetic fieldsBachmann, Maie; Kalda, Jaan; Lass, Jaanus; Tuulik, Viiu; Säkki, Maksim; Hinrikus, HiieMedical & biological engineering & computing2005 / 1, p. 142-149 : ill https://link.springer.com/article/10.1007/BF02345136