Rolling bearings - Angular contact radial ball bearings - Part 4: Single row, double-direction - not self-locking, with double-split inner ring (Four-point contact bearing)— 10 стр.
Heat-treated steels, alloy steels and free-cutting steels - Part 17: Ball and roller bearing steels (ISO 683-17:1999); German version EN ISO 683-17:1999— 20 стр.