RT Journal Article T1 One-sided Cp estimates via M# function. A1 Lorente-Domínguez, María A1 Martín-Reyes, Francisco Javier A1 Rivera Ríos, Israel P. K1 Sistemas lineales AB We recall that w ∈ C+p if there exist " > 0 and C > 0 such that for any a < b < c with c − b < b − a and any measurable set E ⊂ (a, b), the following holds.This condition was introduced by Riveros and de la Torre as a one-sided counterpart of the Cp condition studied first by Muckenhoupt and Sawyer. In this paper we show that given 1