Upper sets and quasisymmetric maps. Trotsenko, D.A.; Väisälä, J. — 1999 Annales Academiae Scientiarum Fennicae. Mathematica
Uniform domains of higher order. II. Alestalo, P.; Väisälä, J. — 1996 Annales Academiae Scientiarum Fennicae. Mathematica
Normal families, multiplicity and the branch set of quasiregular maps. Martio, O.; Srebro, U.; Väisälä, J. — 1999 Annales Academiae Scientiarum Fennicae. Mathematica
Banach spaces and bilipschitz maps J. Väisälä — 1992 Studia Mathematica We show that a normed space E is a Banach space if and only if there is no bilipschitz map of E onto E ∖ {0}.
Elliptic Equations and Maps of Bounded Length Disortion. O. Martio; J. Väisälä — 1988 Mathematische Annalen