@article{M2AN_2020__54_6_1951_0,
     author = {Smears, Iain and Vohral{\'\i}k, Martin},
     title = {Simple and robust equilibrated flux \protect\emph{a posteriori} estimates for singularly perturbed reaction{\textendash}diffusion problems},
     journal = {ESAIM: Mathematical Modelling and Numerical Analysis },
     pages = {1951--1973},
     publisher = {EDP-Sciences},
     volume = {54},
     number = {6},
     year = {2020},
     doi = {10.1051/m2an/2020034},
     mrnumber = {4160328},
     language = {en},
     url = {http://archive.numdam.org/articles/10.1051/m2an/2020034/}
}