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+@book{maclane,
+  author = {Mac Lane, Saunders},
+  title = {Categories for the Working Mathematician},
+  year = 1971,
+  publisher = {Springer-Verlag New York, Inc.},
+  langid = {english}
+}
+@book{joyofcats,
+  author = {Adámek, Jiří and Herrlich, Horst and Strecker, George},
+  title = {Abstract and Concrete Categories: The Joy of Cats},
+  year = {1990},
+  publisher = {John Wiley \& Sons, Inc.},
+  langid = {english}
+}
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