@Book{Bueler2021,
  AUTHOR    = {E. Bueler},
  TITLE     = {{PETSc} for {P}artial {D}ifferential {E}quations: {N}umerical
               {S}olutions in {C} and {P}ython},
  PUBLISHER = {SIAM Press},
  ADDRESS   = {Philadelphia},
  YEAR      = {2021},
  URL       = {https://github.com/bueler/p4pdes},
}
@Book{Bueler2021,
  AUTHOR    = {E. Bueler},
  TITLE     = {{PETSc} for {P}artial {D}ifferential {E}quations: {N}umerical
               {S}olutions in {C} and {P}ython},
  PUBLISHER = {SIAM Press},
  ADDRESS   = {Philadelphia},
  YEAR      = {2021},
  ISBN      = {9781611976304},
  URL       = {https://github.com/bueler/p4pdes},
}
Add nonstandard bibtex field "isbn" for completeness.
Add nonstandard bibtex field "isbn" for  completeness.
