^ abcde"US-K (73D6)". Gunter's Space Page. 2012-03-08. Retrieved 2012-04-21.
^ abcde"Cosmos 2351". National Space Science Data Centre. 2012-04-20. Retrieved 2012-04-25.
^ abcdMcDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 30 April 2012.
^McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 2 May 2012.
^Paleologue, A (2005). "Early Warning Satellites in Russia: What past, what state today, what future?". In Pejmun Motaghedi (ed.). Proceedings of SPIE Vol. 5799. Modeling, Simulation, and Verification of Space-based Systems II. SPIE. pp. 146–157. doi:10.1117/12.603478.
Payloads are separated by bullets ( · ), launches by pipes ( | ). Crewed flights are indicated in underline. Uncatalogued launch failures are listed in italics. Payloads deployed from other spacecraft are denoted in (brackets).