1. (1) http://www.schoepski.com/states/illinois/Sund-strand/sundstrand.htm
2. (2) NAS979, Uniform cutting tests-NAS series, metal cutting equipment specifications (1969), 34-37.
3. (3) ISO 10791-1: Test code for machining centers- Part 1: Geometric test for machines with horizontal spindle and with accessory heads (horizontal Z-axis), first edition, (1998).
4. (4) ISO 10791-2: Test conditions for machining centers- Part 2: Geometric tests for machines with vertical spindle or universal heads with vertical primary rotary axis (vertical Z-axis), first edition, (2001).
5. (5) ISO 10791-3: Test conditions for machining centers- Part 3: Geometric tests for machines with integral indexable or continuous universal heads (vertical Z-axis), first edition, (1998).