TY - RPRT TI - Proof testing of ceramics : I. experiment AU - Ritter, J E AU - Oates, P B AU - Fuller, E R AU - Wiederhorn, S M PY - 1979 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS IR 79-1934 DO - 10.6028/NBS.IR.79-1934 ER -