@techreport{Chew21tr,
 author = {Leroy Chew},
 institution = {Algorithms and Complexity Group, TU Wien},
 number = {AC-TR-21-013},
 title = {Hardness and Optimality in QBF Proof Systems Modulo NP},
 url = {http://www.ac.tuwien.ac.at/files/tr/ac-tr-21-013.pdf},
 year = {2021}
}