http://www.ng.ru/kartblansh/2018-12-16/3_7463_kartb.html
https://www.radiosvoboda.org/a/donbass-realii/29656503.html
https://ru.krymr.com/a/pochemu-zaderzhali-edema-bekirova/29656153.html
https://www.gazeta.ru/army/2018/12/13/12093823.shtml
https://www.kommersant.ru/doc/3828929
https://www.kommersant.ru/doc/3828355
Is US Army Artillery progressing toward being able to outrange and outgun Russian and Chinese weapons
https://www.rbc.ru/newspaper/2018/12/11/5c09419b9a7947781ad3fa28