1. The Mizar mathematical library.
http://mizar.org
2. An, Y., Janssen, J., Milios, E.: Characterizing and mining citation graphs of the computer science literature. Knowl. Inf. Syst. 6, 664–678 (2004)
3. Blanchette, J.C., Böhme, S., Fleury, M., Smolka, S.J., Steckermeier, A.: Semi-intelligible Isar proofs from machine-generated proofs. Accepted in J. Autom. Reason.
http://www21.in.tum.de/~blanchet/isar2.pdf
4. Blanchette, J.C., Böhme, S., Paulson, L.C.: Extending Sledgehammer with SMT solvers. J. Autom. Reason. 51(1), 109–128 (2013)
5. Blanchette, J.C., Greenaway, D., Kaliszyk, C., Kühlwein, D., Urban, J.: A learning-based relevance filter for Isabelle/HOL (2015) (Submitted).
http://www21.in.tum.de/~blanchet/mash2.pdf