Frege, Gottlob. “On Sense and Reference” (1892), in Brian McGuinness, ed., Collected Papers on Mathematics, Logic, and Philosophy (Oxford: Basil Blackwell, 1984).
Frege, Gottlob. “On Concept and Object” (1892), in Brian McGuinness, ed., Collected Papers on Mathematics, Logic, and Philosophy (Oxford: Basil Blackwell, 1984).
Frege, Gottlob. “The Thought: A Logical Investigation” (1918), in Brian McGuinness, ed., Collected Papers on Mathematics, Logic, and Philosophy (Oxford: Basil Blackwell, 1984).
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