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"operators theory: advances and applications" » "operations theory: advances and applications"
"operators theory: advanced and applications" » "operations theory: advanced and applications"
"operator theory: advances and applications" » "operation theory: advances and applications"
"operators theory: advances and applications" » "operations theory: advances and applications"
"operators theory: advanced and applications" » "operations theory: advanced and applications"
"operator theory: advances and applications" » "operation theory: advances and applications"