Behaviour of the spinning gyro rotor / by C. HuberMeasurement of the intensity of progressive ultrasonic waves by means of Raman-Nath diffraction / by M. StapperSensing inertial rotation with tuning forks / by P.J. Jeuken, C. Huber, C.E. MuldersOn the theory of maximum likelihood estimation of structural relations / by J. Jansen and J.F. BarrettAdaptive random search / by J. Kregting and R.C. White JuniorThe design of a mock circulation system / by W.H. LeliveldA comparative analysis of several models of the ventricular depolarisation; introduction of a string model / by A.A.H. DamenThe multiple dipole model of the ventricular depolarisation / by A.A.H. Damen and H.A.L. PiceniOn the identification of continuous lineair processes / by A.J. BreimerAnalysis of physiological systems by parameter estimation techniques / by J.A. BlomSeparation of signals due to arterial and venous bloodflow, in the doppler system, that uses continuous ultrasound / W.P. GoesObservability of electrical heart activity studied with the singular value decomposition / by J.J. van der Kam and Adrianus Antonius Hubertus Damen