Application of Weierstrass units to relative power integral bases
  Let $K$ be an imaginary quadratic field other than $\mathbb{Q}(\sqrt{-1})$ and $\mathbb{Q}(\sqrt{-3})$. We construct relative power integral bases between certain abelian extensions of $K$ in terms of Weierstrass units. 
Ho Yun Jung, Ja Kyung Koo and Dong Hwa Shin
math.NT