F. W. Hecker

Computer-Aided Measurement of Relative Retardations in Plane Photoelasticity

F. W. Hecker, B. Morche, F. Hecker, 1986 .

General relations of strain-gradient stress analysis

Jerzy T. Pindera, F. W. Hecker, J. Pindera, 1996 .

Basic theory and experimental techniques of the strain-gradient method

Jerzy T. Pindera, F. W. Hecker, 1987 .