TY - RPRT TI - Proof testing of ceramics : II. theory AU - Fuller, E R AU - Wiederhorn, S M AU - Ritter, J E AU - Oates, P B PY - 1979 PB - National Bureau of Standards CY - Gaithersburg, MD SN - NBS IR 79-1944 DO - 10.6028/NBS.IR.79-1944 ER -