TITLE: Non-existence of small resolutions for the singularity $y^2=u^2+v^2+w^3$
QUESTION [14 upvotes]: In his paper "Smooth models for elliptic threefolds" (In: The Birational Geometry of Degenerations, Progress in Mathematics, v. 29, Birkhauser, (1983), 85-133), Rick Miranda mentions in the example of section 8 (page 101-102) that it is an unfortunate fact of life that there are no small resolutions for the singularity of the threefold defined by the equation 
$$y^2=u^2+v^2+w^3\quad \text{in}\quad \mathbb{C}^4.$$
He said that it is a theorem of  Brieskorn but he does not give a reference. Anyone has a reference to this theorem and its proof?
Updated (following some of the answers, the question can be generalized right away):
More generally the same question can be asked for 
$$y^2=u^2+v^2+w^{2k+1}\quad \text{in}\quad \mathbb{C}^4, \quad\text{where} \quad  k \in \mathbb{N}_0.$$

REPLY [5 votes]: This answer to a more general question might also be relevant for similar questions.