RT Journal Article SR Electronic T1 Different effects of atenolol and nebivolol on coronary flow reserve JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 1690 OP 1691 DO 10.1136/hrt.2005.084079 VO 92 IS 11 A1 H Gullu A1 D Erdogan A1 M Caliskan A1 D Tok A1 I Yildirim A1 A T Sezgin A1 H Muderrisoglu YR 2006 UL http://heart.bmj.com/content/92/11/1690.abstract AB