BJÖRK L.; ERIKSON U.; FALK J.; INGELMAN B.; LINDBLAD G. Improved Polymeric Contrast Agents for Roentgenologic Examination of the Gastrointestinal Tract: II. Preliminary Report on Animal Investigations. Upsala Journal of Medical Sciences, v. 79, n. 2, p. 106-108, 1 Jun. 1974.