#### Volume 8, issue 4 (2008)

 1 M Cai, X Chen, Z Lü, Small covers over prisms, Topology Appl. 154 (2007) 2228 MR2328006 2 S Choi, M Masuda, D Y Suh, Quasitoric manifolds over a product of simplices, to appear in Osaka J. Math. arXiv:0803.2749 3 M W Davis, T Januszkiewicz, Convex polytopes, Coxeter orbifolds and torus actions, Duke Math. J. 62 (1991) 417 MR1104531 4 N È Dobrinskaya, The classification problem for quasitoric manifolds over a given polytope, Funktsional. Anal. i Prilozhen. 35 (2001) 3 MR1850429 5 A Garrison, R Scott, Small covers of the dodecahedron and the $120$–cell, Proc. Amer. Math. Soc. 131 (2003) 963 MR1937435 6 Z Lü, M Masuda, Equivariant classification of $2$–torus manifolds, Preprint (2008) 7 M Masuda, T E Panov, Semifree circle actions, Bott towers, and quasitoric manifolds, Sbornik Math. 199 (2008) 1201 8 B D McKay, F E Oggier, G F Royle, N A Sloane, I M Wanless, H S Wilf, Acyclic digraphs and eigenvalues of $(0,1)$–matrices, J. Integer Seq. 7 (2004) MR2085343 9 R W Robinson, Enumeration of acyclic digraphs, from: "Proc. Second Chapel Hill Conf. on Combinatorial Mathematics and its Applications", Univ. North Carolina (1970) 391 MR0276143 10 R W Robinson, Counting unlabeled acyclic digraphs, from: "Combinatorial mathematics, V (Proc. Fifth Austral. Conf., Roy. Melbourne Inst. Tech., 1976)" (editor C H C Little), Lecture Notes in Math. 622, Springer (1977) 28 MR0476569 11 R P Stanley, Acyclic orientations of graphs, Discrete Math. 5 (1973) 171 MR0317988