Giovanni Alberti, Guy Bouchitté, Gianni Dal Maso. The calibration method for the Mumford-Shah functional and free-discontinuity problems.
Calculus of Variations and Partial Differential Equations, Springer Verlag, 2003, 16 (3), pp.299--333.
⟨10.1007/s005260100152⟩.
⟨hal-01283208⟩