نبذة مختصرة : We build up a quantitative second order Sobolev estimate of $ \ln w$ for positive $p$-harmonic functions $w$ in Riemannian manifolds under Ricci curvature bounded from blow and also for positive weighted $p$-harmonic functions $w$ in weighted manifolds under the Bakry-\'{E}mery curvature-dimension condition.
Comment: Final version incorporated referee's comments
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