S. K. Williams

Pulmonary arterial hypertension: a contemporary review.

E. Scalzetti, B. Markarian, L. P. Gordon, 1989, Radiographics : a review publication of the Radiological Society of North America, Inc.

Indications for implantation of a dual-chamber pacemaker combined with an implantable cardioverter-defibrillator.

S. Higgins, S. K. Williams, D. Meyer, 1998, The American journal of cardiology.