@article{CML_2023__15__27_0,
     author = {Haim Brezis and Petru Mironescu},
     title = {Non-local approximations of the gradient},
     journal = {Confluentes Mathematici},
     pages = {27--44},
     publisher = {Institut Camille Jordan},
     volume = {15},
     year = {2023},
     doi = {10.5802/cml.91},
     language = {en},
     url = {https://cml.centre-mersenne.org/articles/10.5802/cml.91/}
}