MathSciNet bibliographic data MR574785 (81j:04001) 04A15 (03E15 26A21 28A05 54H05) Louveau, Alain A separation theorem for \$\Sigma \sp{1}\sb{1}\$$\Sigma \sp{1}\sb{1}$ sets. Trans. Amer. Math. Soc. 260 (1980), no. 2, 363–378. Article

For users without a MathSciNet license , Relay Station allows linking from MR numbers in online mathematical literature directly to electronic journals and original articles. Subscribers receive the added value of full MathSciNet reviews.