http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Tiêu chuẩn nhà nước : Hệ thủy lực khí nén và bôi trơn : TCVN 2004 - 77 / TCVN 2017 - 77 / TCVN 2140 - 77 / TCVN 2154 - 77