Remarks on tensor products and their applications in quantum theory I. General considerations J. Blank; P. Exner — 1976 Acta Universitatis Carolinae. Mathematica et Physica
Higher-order terms in th Brueckner-Goldstone perturbation expansions J. Blank; Jiří Hořejší — 1979 Acta Universitatis Carolinae. Mathematica et Physica
Remarks on tensor proucts and their applications in quantum theory - II. Spectral properties J. Blank; P. Exner — 1977 Acta Universitatis Carolinae. Mathematica et Physica