1. Continua and discontinua;Argyris,1966
2. Some general considerations on the natural mode technique, Part I, Small displacements;Argyris;AJRAeS,1969
3. Some general considerations on the natural mode technique, Part II, Large displacements;Argyris;AJRAeS,1969
4. On the stability of elastic equilibrium (in Dutch with English summary);Koiter,1945
5. Stability of structures with small imperfections;Roorda,1965