document.write("« A commentary on single-photon wave function advocated by Bia{\l}ynicki-Birula. (arXiv:1810.05840v1 [math-ph])");document.write(" | ");document.write("A family of compact semitoric systems with two focus-focus singularities. (arXiv:1710.05746v3 [math.SG] UPDATED) »");