found: The polio crusade, c2009:title frame (Julius Youngner, scientist) container (only surviving scientist from the core research team that developed the Salk vaccine)
found: OCLC, Mar. 25, 2010(hds.: Youngner, Julius Stuart; Youngner, Julius Stuart, 1920- ; usage: Julius Stuart Youngner; J.S. Youngner)
found: New York times WWW site, viewed May 5, 2017(in obituary published May 4: Dr. Julius Youngner; Julius Stuart Youngner; b. Oct. 24, 1920, Manhattan; raised in the Bronx; d. Apr. 27, Pittsburgh, aged 96; inventive virologist whose nearly fatal childhood illness destined him to become a medical researcher and a core member of the team that developed the Salk polio vaccine in 1955)