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Ritva Tammivaara-Hilty. (1973) Central Haemodynamics during Hypoxia, Hyperoxia and Hypercapnoea in Severe Chronic Obstructive Lung Disease. Upsala Journal of Medical Sciences 78:2, pages 116-132.
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Ritva Tammivaara-Hilty. (1973) Gas Exchange in Severe Chronic Obstructive Lung Disease in Relation to Inspired Oxygen and Increased Carbon Dioxide Fraction, Physical Exercise and Body Posture. Upsala Journal of Medical Sciences 78:2, pages 98-115.
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B. Furberg$suffix/text()$suffix/text(), L. Nordgren$suffix/text()$suffix/text() & Ritva Tammivaara-Hilty$suffix/text()$suffix/text(). (1972) P-Wave Analysis in Chronic Obstructive Lung Disease with Pulmonary Hypertension. Upsala Journal of Medical Sciences 77:3, pages 163-166.
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