Before revision:  This approach leads to a convex optimisation problemand it is numerically solved ] via an augmented Lagrangian method and the alternative direction method of multipliers (ADMM) algorithm  .
After revision:  This approach leads to a convex optimisation problemand it is numerically solved ], we formulate the problem as a convex optimization problem, derive its dual formulation, and solve it numerically via an augmented Lagrangian method and the alternative direction method of multipliers (ADMM) algorithm .