Canonical formalism for quasi-classical particle "Zitterbewegung" in   Ostrohrads'kyj mechanics
  The homogeneous canonical formalism of Rund is applied to the second-order Lagrangian model of the self-interacting particle of Bopp. The quasi-classical free spinning particle of Mathisson appears then as a constrained subsystem of the previous system. Differential-geometric mechanisms offered in this work are formulated in a fairy general manner, although revealed here in a particular example of physical meaning. 
Roman Matsyuk
math-ph math.DG math.MP