H. J. Hardonk

Objective evaluation of antitussive agents under clinical conditions.

H. Beumer, B. van Eijnsbergen, J. Boter, 1976, Respiration; international review of thoracic diseases.

Effects of beta-adrenergic blocking drugs on ventilatory function in asthmatics

H. J. Hardonk, Beumer Hm, 1972, European Journal of Clinical Pharmacology.