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• Unai, Akihito: A weak comparison principle for some quasilinear elliptic operators: it compares functions belonging to different spaces. (English). Applications of Mathematics, vol. 63 (2018), issue 4, pp. 483-498
• Jaroš, Jaroslav: Picone's identity for a Finsler $p$-Laplacian and comparison of nonlinear elliptic equations. (English). Mathematica Bohemica, vol. 139 (2014), issue 3, pp. 535-552