Weak type endpoint bounds for Bochner-Riesz multipliers. Michael Christ (1987) Revista Matemática Iberoamericana
Weyl transforms associated with the Riemann-Liouville operator. Hamadi, N.B., Rachdi, L.T. (2006) International Journal of Mathematics and Mathematical Sciences
Whitney's extension theorem for nonquasianalytic classes of ultradifferentiable functions J. Bonet, R. Braun, R. Meise, B. Taylor (1991) Studia Mathematica