1. Movement of the base of the ventricle and the relative constancy of the cardiac volume;Hamilton;Am J Physiol,1932
2. Invariant total heart volume in the intact thorax;Hoffman;Am J Physiol,1985
3. Law of constant volume in humans: a non-invasive assessment via X-ray CT, MRI and echo (abstr);Hoffman;J Am Coll Cardiol,1987
4. Intracardiac cycle constancy of total heart volume;Huffman;Dynamic Cardiovasc Imag,1987
5. A geometric view of cardiac “efficiency” (abstr);Hoffman;J Am Coll Cardiol,1989