Sommerville, Q. (16. mars 2023). «Bakhmut: Russian casualties mount but tactics evolve». BBC. Besøkt 25. juli 2023. «Peering out into the bare landscape, is a Maxim belt-fed machine gun with stout iron wheels. "It only works when there is a massive attack going on… then it really works," says Borys. "So we use it every week".»
books.google.com
Studia Orientalia. 95. Finnish Oriental Society, Suomen Itämainen Seura. 2003. ISBN9789519380544. Besøkt 29. oktober 2017. «The Crimean War did have its own innovations: massive trench works and trench warfare [...].»