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APA Citation
Grey, J. (2017). the Modal Equivalence Rules of the Port-Royal Logic. History and philosophy of logic, 38(3), 210–221. http://access.bl.uk/ark:/81055/vdc_100046691932.0x00004d
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Grey, J. (2017). the Modal Equivalence Rules of the Port-Royal Logic. History and philosophy of logic, 38(3), 210–221. http://access.bl.uk/ark:/81055/vdc_100046691932.0x00004d