Degenerate problems with irregular obstacles

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Calderón–Zygmund theory for nonlinear elliptic problems with irregular obstacles (2012, methodology): “The main approach in [2] is the so-called maximal function-free technique which was introduced in [1] and later employed in many papers, for instance, [8,14] and references therein.”
Higher differentiability for solutions to a class of obstacle problems (2018, background): “Moreover we refer to [3,39] for gradient continuity for nonlinear obstacle problems, [20] for global results up to the boundary, [5] for the parabolic case, [6] for the porous medium problem.”
Global Calderón–Zygmund theory for nonlinear parabolic systems (2013, background): “In the setting of obstacle problems we refer to [9, 38].”
Calderón–Zygmund estimates for parabolic p(x,t)-Laplacian systems (2014, methodology): “Later on, extensions to general parabolic systems have been obtained by Duzaar, Mingione and Steffen [22] while a Calderón-Zygmund theory for evolutionary obstacle problems can be found in [12, 32].”