Sohail, Iqbal DESIGN AND STUDY OF FLAPPING MECHANISM WITH ASYMMETRIC FREQUENCIES / Sohail Iqbal - Islamabad : CEME- NUST, 2012. - viii, 64 p. : ill. ; 30cm. Hardcover. Publisher. No.: CEME -NUST, Nat. Bib. No.: Subjects--Personal Names: LC Class. No.: 620.1 Dewey Class. No.: 620.1