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14. [Spectrum analysis of the variability of heart rate in athletes]. Costa O, Freitas J, Puig J, Carvalho MJ, Freitas A, Ramos J, Puga N, Lomba I, Fernandes P, de Freitas F. Rev Port Cardiol; 1991 Jan; 10(1):23-8. PubMed ID: 2059462 [Abstract] [Full Text] [Related]
19. Active and quiet periods in the preterm and term fetus. Dierker LJ, Pillay SK, Sorokin Y, Rosen MG. Obstet Gynecol; 1982 Jul; 60(1):65-70. PubMed ID: 7088451 [Abstract] [Full Text] [Related]