O. Brulin,R. K. T. Hsieh.International Conference on Continuum Models of Discrete Systems (4th : 1981 : Stockholm)：Continuum Models of Discrete Systems 4 : proceedings of the 4th International Conference on Continnum Models of Discrete Systems, Stockholm, Sweden 1981.North-Holland Pub. Co.,1981.
International Conference on Continuum Models of Discrete Systems (4th : 1981 : Stockholm)：Continuum Models of Discrete Systems 4 : proceedings of the 4th International Conference on Continnum Models of Discrete Systems, Stockholm, Sweden 1981
O. Brulin,R. K. T. Hsieh.North-Holland Pub. Co.,1981.
