Maximal Monotonicity of Operators with Sufficiently Large Domain and Application to the Hartree Problem. Jürgen Weyer (1982) Manuscripta mathematica
Method of orthogonal projections and approximation of the spectrum of a bounded operator II Andrzej Pokrzywa (1981) Studia Mathematica
Modular forms of varying weights. Roelof W. Bruggeman (1986) Journal für die reine und angewandte Mathematik