http://www.sfs.uni-tuebingen.de/~cebert/publikationen.html (全文テキスト(全般))
http://www.sfs.uni-tuebingen.de/~cebert/papers/phdthesis.pdf (全文テキスト(全般))
Ebert, C. (2005). Formal investigations of underspecified representations. PhD Thesis, Univ., London.