1. Martin's Axiom does not imply that every two N1-dense sets of reals are isomorphic;ABRAHAM;Israel J. Math.,1998
2. Über nulldimensionale Punktmengen;ALEXANDROFF;Mathematische Annalen,1927
3. BALOGH, Z. and H. JUNNILA [1927] Totally analytic spaces under V = L.
4. All N1-dense sets of reals can be isomorphic;BAUMGARTNER;Fund. Math.,1973
5. Chains and antichains in P(ω);BAUMGARTNER;J. Symbolic Logic,1980