1. L. Ambrosio, M. Colombo, and S. Di Marino, Sobolev spaces in metric measure spaces: reflexivity and lower semicontinuity of slope, Variational Methods for Evolving Objects, Mathematical Society of Japan, 2015.
2. L. Ambrosio, N. Gigli and G. Savaré, Density of Lipschitz functions and equivalence of weak gradients in metric measure spaces, Rev. Mat. Iberoam. 29 (2013), 969–996.
3. I. U. Asekritova, N. Ya. Kruglyak, L. Maligranda, and L.-E. Persson, Distribution and rearrangement estimates of the maximal function and interpolation, Studia Math. 124 (1997), 107–132.
4. P. Auscher and L. Bandara, Real Harmonic Analysis, ANU eView, Canberra, 2012.
5. C. Bennett and R. Sharpley, Weak-type inequalities for H p and BMO, in Harmonic Analysis in Euclidean Spaces (Williamstown, MA, 1978), Amer. Math. Soc., Providence, RI, 1979.