John W. Barrett 0001 Stephen Langdon Robert Nürnberg Finite element approximation of a sixth order nonlinear degenerate parabolic equation. 401-434 2004 96 Numerische Mathematik 3 https://doi.org/10.1007/s00211-003-0479-4 https://www.wikidata.org/entity/Q117202815 db/journals/nm/nm96.html#BarrettLN04