By Oja Eve   in Mathematische Zeitschrift

ISSN:0025-5874|258|2|333-345

Springer Publishing Company ‎(2008)‎

Access to resources Favorite 18.892029

By Oja Eve   Randala Vaiki   in Quaestiones Mathematicae

ISSN:1727-933X|32|2|269-279

Taylor & Francis Ltd‎(2009)‎

Access to resources Favorite 15.113624