15 January 2013. Retrieved 9 October 2015. ↑ http://sputniknews.com/military/20151212/1031641742/russian-ship-black-navy-fleet-kalibr-missile-system.html ↑ "Work Begins on 6th Missile Boat for Caspian Flotilla". sputniknews. 29 August 2013.