Betancor, Jorge J., Alejandro J. Castro, Juan C. Fariña, y Rodríguez-Mesa. «Conical square functions associated with Bessel, Laguerre and Schrödinger operators in UMD Banach spaces». Journal of Mathematical Analysis and Applications 447, n.º 1 (2017): 32-75. https://doi.org/10.1016/J.JMAA.2016.10.006.