Remarks on l-conformal extension of the Newton-Hooke algebra
  The l-conformal extension of the Newton-Hooke algebra proposed in [J. Math. Phys. 38 (1997) 3810] is formulated in the basis in which the flat space limit is unambiguous. Admissible central charges are specified. The infinite-dimensional Virasoro-Kac-Moody type extension is given. 
Anton Galajinsky, Ivan Masterov
hep-th math-ph math.MP