@article {Lusin:August 2003:0955-792X:481,
	author = "Lusin S.",
	author = "Salibra A.",
	title = "A Note on Absolutely Unorderable Combinatory Algebras",
	journal = "Journal of Logic and Computation",
	volume = "13",
	year = "August 2003",
	abstract = "<P></P>Plotkin has conjectured that there exists an <I>absolutely unorderable</I> combinatory algebra, namely a combinatory algebra which cannot be embedded in another combinatory algebra admitting a nontrivial compatible partial order. In this paper we prove that a wide class of combinatory algebras admits extensions with a nontrivial compatible partial order.",
	pages = "481-502(22)",
	url = "http://www.ingentaconnect.com/content/oup/logcom/2003/00000013/00000004/art00481"
}