Valentina Barucci 
Maximality Properties in Numerical Semigroups and Applications to One-Dimensional Analytically Irreducible Local Domains [PDF ebook] 

If $k$ is a field, $T$ an analytic indeterminate over $k$, and $n_1, /ldots , n_h$ are natural numbers, then the semigroup ring $A = k[[T^{n_1}, /ldots , T^{n_h}]]$ is a Noetherian local one-dimensional domain whose integral closure, $k[[T]]$, is a finite