Double Catalan monoids Volodymyr MazorchukBenjamin Steinberg OriginalPaper 20 December 2011 Pages: 333 - 354
On twin and anti-twin words in the support of the free Lie algebra Ioannis C. Michos OriginalPaper 28 December 2011 Pages: 355 - 388
On the nullspace of arc-transitive graphs over finite fields Primož PotočnikPablo SpigaGabriel Verret OriginalPaper 16 December 2011 Pages: 389 - 401
Two distance-regular graphs Andries E. BrouwerDmitrii V. Pasechnik OriginalPaper Open access 20 December 2011 Pages: 403 - 407
Staircase skew Schur functions are Schur P-positive Federico ArdilaLuis G. Serrano OriginalPaper 31 January 2012 Pages: 409 - 423
Foulkes characters, Eulerian idempotents, and an amazing matrix Persi DiaconisJason Fulman OriginalPaper 31 January 2012 Pages: 425 - 440
Planar flows and quadratic relations over semirings Vladimir I. DanilovAlexander V. KarzanovGleb A. Koshevoy OriginalPaper 28 January 2012 Pages: 441 - 474
Cluster-additive functions on stable translation quivers Claus Michael Ringel OriginalPaper 14 February 2012 Pages: 475 - 500