193,472 ULTRASOUND Ultrasound and 'ballistocardiography in cardiovascular research. Proceedings of the 17th Annual Meeting of the Ballisto- cardiograph Research Society, Atlantic City, N.J. April 1973. Ed. Jan Baan. Basel 1974 S. Karger 4° s. nlb. 8, 117, ilustr. Bibliotheca Cardiologica, No. 34.