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"observations theory: advances and applications" » "observations thereon: advances and applications", "observations towards: advances and applications"
"operations theory: advances and applications" » "operators theory: advances and applications", "operator theory: advances and applications", "relations theory: advances and applications"
"operation theory: advances and applications" » "operator theory: advances and applications", "iteration theory: advances and applications", "generation theory: advances and applications"
"observations theory: advances and applications" » "observations thereon: advances and applications", "observations towards: advances and applications"
"operations theory: advances and applications" » "operators theory: advances and applications", "operator theory: advances and applications", "relations theory: advances and applications"
"operation theory: advances and applications" » "operator theory: advances and applications", "iteration theory: advances and applications", "generation theory: advances and applications"