Shevchenko, V. S.; Grankin, K. N.; Nel'Nikov, S. Yu. (1988). "The structure of RSF 4 CYG B - Regions of star formation from an unusual point of view". Astronomicheskii Zhurnal (ISSN 0004-6299). 65: Nov.–Dec. 1988, p. 1230–1243. In Russian. Bibcode:1988AZh....65.1230S.{{cite journal}}: CS1 maint: multiple names: authors list (ลิงก์)
