Mladen Miksa, Jakob Nordström. Long Proofs of (Seemingly) Simple Formulas. In Carsten Sinz, Uwe Egly, editors, Theory and Applications of Satisfiability Testing - SAT 2014 - 17th International Conference, Held as Part of the Vienna Summer of Logic, VSL 2014, Vienna, Austria, July 14-17, 2014. Proceedings. Volume 8561 of Lecture Notes in Computer Science, pages 121-137, Springer, 2014.