VELYCHKO, L. D.; GORCHYNSKIY, I. V. Determination of the magnitude of the frontal air resistance of the bullet, released from the machine guns PK, PKB, PKS and PKT. Military Technical Collection, [S. l.], n. 18, p. 26–31, 2018. DOI: 10.33577/2312-4458.18.2018.26-31. Disponível em: http://vtz.asv.gov.ua/article/view/144942. Acesso em: 9 mar. 2022.