RT Journal Article SR Electronic T1 A Trial of Ampicillin in Chronic Bronchitis JF The Journal of the College of General Practitioners JO J Coll Gen Pract FD British Journal of General Practice SP 244 OP 252 VO 7 IS 2 A1 E. A. Murray YR 1964 UL http://bjgp.org/content/7/2/244.abstract AB