@article{M2AN_2020__54_1_105_0,
     author = {Lee, Hwi and Du, Qiang},
     title = {Nonlocal gradient operators with a nonspherical interaction neighborhood and their applications},
     journal = {ESAIM: Mathematical Modelling and Numerical Analysis },
     pages = {105--128},
     publisher = {EDP-Sciences},
     volume = {54},
     number = {1},
     year = {2020},
     doi = {10.1051/m2an/2019053},
     mrnumber = {4051845},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/m2an/2019053/}
}