@misc{indiciaed70f048b9d8c,
  title = {Nonstandard Finite Difference Schemes: Relations Between Time and Space Step-Sizes in Numerical Schemes for PDE's That Follow from Positivity Condition},
  author = {Mickens, Ronald E.},
  year = {1996},
  url = {https://ntrs.nasa.gov/citations/19960052331},
  note = {Source identifier: 19960052331}
}