1. , , , , . Standard specification for rigid polyurethane foam for use as a standard material for testing orthopedic devices and instruments (F1839-97). Annual book of ASTM standards, medical devices and services. West Conshohocken, The American Society for Testing and Materials, 1998.
2. , , , , Standard test method for determining axial pull-out strength of medical bone screws (F1691-96). Annual book of ASTM standards, medical devices and services. West Conshohocken, The American Society for Testing and Materials, 1998.