Symmetries of the three body problem / Theo van BemmelenNonlocal symmetries and recursion operator of the Landau-Lifshitz equation / Theo van Bemmelen and Paul KerstenThe symmetry equation package for REDUCE / Theo van BemmelenCoverings and nonlocal symmetries / Theo van BemmelenSymmetries and conservation laws of the system / T. van BemmelenSymmetry computations with total derivative operators / Theo van Bemmelen