@incollection{Barles_2013,
    doi = {10.1007/978-3-642-36433-4_2},
    url = {https://doi.org/10.1007%2F978-3-642-36433-4_2},
    year = {2013},
    publisher = {Springer Berlin Heidelberg},
    pages = {49--109},
    author = {Guy Barles},
    title = {An Introduction to the Theory of Viscosity Solutions for First-Order Hamilton{\textendash}Jacobi Equations and Applications},
    booktitle = {Hamilton-Jacobi Equations: Approximations, Numerical Analysis and Applications}
}

@incollection{Barles_2013, doi = {10.1007/978-3-642-36433-4_2}, url = {https://doi.org/10.1007%2F978-3-642-36433-4_2}, year = {2013}, publisher = {Springer Berlin Heidelberg}, pages = {49--109}, author = {Guy Barles}, title = {An Introduction to the Theory of Viscosity Solutions for First-Order Hamilton{\textendash}Jacobi Equations and Applications}, booktitle = {Hamilton-Jacobi Equations: Approximations, Numerical Analysis and Applications} }