Perhaps you should try some spelling variations:
"interaction theory, advances and applications" » "intersection theory, advances and applications", "integration theory, advances and applications", "introduction theory, advances and applications"
"operations theory, advances and applications" » "operators theory, advances and applications", "observations theory, advances and applications", "operator theory, advances and applications"
"operation theory, advances and applications" » "operator theory, advances and applications", "iteration theory, advances and applications", "generation theory, advances and applications"

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