State vector spaces with indefinite metric in quantum field theory

An attempt to represent a state vector space with indefinite metric in quantum field theroy

Role of an indefinite metric in the state space of quantum field theory

The Hilbert Space Structure Condition for Quantum Field Theories with Indefinite Metric and Transformations with Linear Functionals

Field algebras in quantum theory with indefinite metric. IV

On representations of canonical commutation relations in indefinite metric quantum field theory

On quantum theories with indefinite metric