TY - RPRT TI - Ventilatory function tests; voluntary ventilation capacity. AU - J S GRAY AU - D R BARNUM AU - H W MATHESON AU - S N SPIES PY - 1950 DO - 10.1172/jci102304 UR - https://pubmed.ncbi.nlm.nih.gov/15436658/ ID - 15436658 ER -