J Hopman

The effect of respiration on diastolic blood flow velocities in the human heart.

J. Hopman, T. D. de Boo, C Uiterwaal, 1989, European heart journal.

Spectral analysis of heart rate variability in spontaneously breathing very preterm infants

H. Geijn, J. Hopman, G. Stoelinga, 1994, Acta paediatrica.