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2. A ternary algebra with applications to matrices and linear transformations;Hestenes;Arch. Rational Mech. Anal.,1962
3. Relative self-adjoint operators in Hilbert space;Hestenes;Pacific J. Math.,1961
4. Modules over operator algebras;Kaplansky;Amer. J. Math.,1953
5. Inner product modules over B∗-algebras;Paschke;Trans. Amer. Math. Soc.,1973