@article\{ddlw-bespd-06
, author =	"Emilio {Di Giacomo} and Walter Didimo and Giuseppe Liotta and Stephen K. Wismath"
, title =	"Book Embeddability of Series-Parallel Digraphs"
, journal =	"Algorithmica"
, volume =	45
, number =	"4"
, pages =	"531-547"
, year =	2006
}