Essential orders on stratified algebras with duality and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.svg"><mml:mi mathvariant="script">S</mml:mi></mml:math>-subcategories in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si2.svg"><mml:mi mathvariant="script">O</mml:mi></mml:math>
Journal of pure and applied algebra