math.GR math.DS 37C15 (Primary) 22A22, 22E40, 22F05, 22F30, 30F60, 37C85, 37C86,
  53C24, 57S20, 57S25, 58D27, 58H05, 58H15 (Secondary)
The orbit-fixing deformation spaces of an action of a Lie groupoid
Hirokazu Maruhashi