Henzinger, Monika H, and Angelina Vidali. “Multi-Parameter Mechanism Design under Budget and Matroid Constraints.”https://doi.org/10.1007/978-3-642-23719-5_17__In 19th Annual European Symposium on Algorithms, 6942:192–202. Springer Nature, 2011.https://doi.org/10.1007/978-3-642-23719-5_17 .