Invariants of Topological Relative Right Equivalences
  The constancy of the Milnor number has several characterizations which were summarized by Greuel in 1986. This paper presents a study of these characterizations in the case of families of functions with isolated singularities defined on an analytic variety. 
Imran Ahmed, Maria Aparecida Soares Ruas and Jo\~ao Nivaldo Tomazella
math.AG