### Bibliography

#### Works connected to ~~Ulrich Oberst~~

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Projective classes and acyclic models,” pp. 78–91 in Reports of the Midwest category seminar. Lecture Notes in Mathematics 47. Springer (Berlin), 1967. MR 0236245 incollection

: “Reports of the Midwest category seminar. Lecture Notes in Mathematics 47. Springer (New York), 1967. MR 0220788 Zbl 0165.33001 book

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