[Monetdb-developers] PhD Thesis Steenhagen Optimization of object query languages

Hello, sorry for this OT question. I was reading the literature relevant to what I would like to do and found the papers of H. Steenhagen. A thesis is referenced very often which I could order a dead-tree copy of. But that would probably take very long: Title: Optimization of object query languages Author: Hendrika Janna Steenhagen (1954-) Year: 1995 Note: Proefschrift Universiteit Twente Met lit. opg., index. - Met een samenvatting in het Nederlands ISBN: 90-9008745-1 Does anybody on the list have a digital copy of it or knows where one is available? Many thanks Kambiz