Operational history
Russia Resumes Patrols by Nuclear Bombers
https://web.archive.org/web/20170626141853/http://www.nytimes.com/2007/08/18/world/europe/17cnd-russia.html?hpRussia Resumes Patrols by Nuclear Bombers (Published 2007)
https://www.nytimes.com/2007/08/18/world/europe/17cnd-russia.html?hpWayback Machine - Wikipedia
https://en.wikipedia.org/wiki/Wayback_MachineRussia’s Backfire Bomber Is Back!
https://web.archive.org/web/20161025054731/https://warisboring.com/russias-backfire-bomber-is-back-2618703120b7https://warisboring.com/russias-backfire-bomber-is-back-2618703120b7#.ffnmydcnq
https://warisboring.com/russias-backfire-bomber-is-back-2618703120b7#.ffnmydcnq
Development
Book sources - Wikipedia
https://en.wikipedia.org/wiki/Special:BookSources/1-904687-84-9International Standard Book Number - Wikipedia
https://en.wikipedia.org/wiki/ISBN_(identifier)