G. Campero-Arena J. K. Truss Countable, 1-transitive, coloured linear orderings I. 1-13 2004 105 J. Comb. Theory, Ser. A 1 http://dx.doi.org/10.1016/j.jcta.2003.08.005 db/journals/jct/jcta105.html#Campero-ArenaT04