Rotation-free solutions with positive infimum of the equation ...u = Pu in a neighbourhood of a singularity of the density P. J.L. Schiff — 1972 Publications de l'Institut Mathématique [Elektronische Ressource]
Hp-Spaces of Harmonic Functions and the Wiener Compactification. Joel L. Schiff — 1973 Mathematische Zeitschrift
Inclusion-exclusion redux. Kessler, David; Schiff, Jeremy — 2002 Electronic Communications in Probability [electronic only]