Oswin Aichholzer David Orden Francisco Santos Bettina Speckmann On the number of pseudo-triangulations of certain point sets. 254-278 2008 115 J. Comb. Theory, Ser. A 2 http://dx.doi.org/10.1016/j.jcta.2007.06.002 db/journals/jct/jcta115.html#AichholzerOSS08