Some remarks on the multiple Weierstrass transform and Abel summability of multiple Fourier-Hermite series Calixto Calderón — 1969 Studia Mathematica
Conjugate kernels and convergence of harmonic singular integrals Calixto Calderón — 1971 Studia Mathematica
Weak type estimates for the Hardy-Littlewood maximal functions Luis Caffarelli; Calixto Calderón — 1974 Studia Mathematica
On Abel summability of multiple Jacobi series Luis A. Caffarelli; Calixto P. Calderón — 1974 Colloquium Mathematicae