RT Journal Article SR Electronic T1 BIRD MUSCLE POWER NOT LIMITED SOLELY BY WINGBEAT FREQUENCY JF The Journal of Experimental Biology JO J. Exp. Biol. FD The Company of Biologists Ltd SP ii OP ii DO 10.1242/jeb.054932 VO 214 IS 3 A1 Knight, Kathryn YR 2011 UL http://jeb.biologists.org/content/214/3/ii.abstract AB