MathSciNet bibliographic data MR1976349 (2004c:35035) 35B65 (22E30 35A30 35D10 35J60) Marchi, Silvana \$L\sp p\$$L\sp p$ regularity of the derivative in the second commutator direction for nonlinear elliptic equations on the Heisenberg group. Rend. Accad. Naz. Sci. XL Mem. Mat. Appl. (5) 26 (2002), 1–15. Links to the journal or article are not yet available

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