Power spectral analysis of heart rate and arterial pressure variabilities as a marker of sympatho-vagal interaction in man and conscious dog. - Pagani,M.; Lombardi,F.; Guzzetti,S.; Rimoldi,O.; Furlan,R.; Pizzinelli,P.; Sandrone,G.; Malfatto,G.; Dell'Orto,S.; Piccaluga,E. (Circ Res, 1986)