Lie Group Analysis of a Flow with Contaminant-Modified Viscosity by Raseelo J. Moitsheki

“…We also employ potential symmetry methods for chosen cases of concentration and a zero source term. Some invariant solutions are constructed using both classical Lie point and potential symmetries.…”
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Nonstationary Equations for the Reaction Layer with the Degenerate Equilibrium Points by Aleksei A. Bykov, Kristina E. Ermakova

“…There  is also an intermediate unstable  state  with zero source density,  in which the sign reversal also takes place.  …”
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