A double-blind trial of nocturnal supplemental oxygen for sleep desaturation in patients with chronic obstructive pulmonary disease and a daytime PaO2 above 60 mm Hg - Fletcher,E.C.; Luckett,R.A.; Goodnight-White,S.; Miller,C.C.; Qian,W.; Costarangos-Galarza,C. (Am Rev Respir Dis, 1992)