http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Giới thiệu 2 phần chính: Phần 1 trình bày về bê tông xốp và silicat xốp; Phần 2 nói về cốt liệu rỗng dùng cho bê tông nhẹ; TM tài liệu tham khảo tr.199
Nguyễn Văn Phiêu, Nguyễn Văn Chánh