Block (or Hamiltonian) Lie symmetry of dispersionless D type   Drinfeld-Sokolov hierarchy
  In this paper, the dispersionless D type Drinfeld-Sokolov hierarchy, i.e. a reduction of the dispersionless two-component BKP hierarchy, is studied. The additional symmetry flows of this herarchy are presented. These flows form an infinite dimensional Lie algebra of Block type as well as a Lie algebra of Hamiltonian type. 
Chuanzhong Li, Jingsong He, Yucai Su
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