A free vibration analysis of grillages by displacementArjassov, Gennadi; Pappel, Toivo; Teder, LeoBEM/FEM-2000 : 18th International Conference Mathematical Modelling in Mechanics of Solid and Structures by Boundary & FEM. Vol. 22000 / p. 48-54 On the generalization and development of the method of gridsArjassov, GennadiBEM/FEM-2000 : 18th International Conference Mathematical Modelling in Mechanics of Solid and Structures by Boundary & FEM. Vol. 22000 / p. 32-40