A new macromolecule as a contrast agent for MR angiography: preparation, properties, and animal studies. - Bogdanov,A.A.; Weissleder,R.; Frank,H.W.; Bogdanova,A.V.; Nossif,N.; Schaffer,B.K.; Tsai,E.; Papisov,M.I.; Brady,T.J. (Radiology, 1993)