The following documents are available

ismb94.ps
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P. Bucher and A. Bairoch (1994)
A Generalized Profile Syntax for Biomolecular Sequence Motifs and its Function in Automatic Sequence Interpretation
in: Proceedings of the 2nd International Conference on Intelligent Systems in Molecular Biology. 
AAAI press, Menlo Park (CA)

cmb94.ps
========
P. Bucher (1994)
A Flexible Motif Search Technique Based on Generalized Profiles
submitted to: Computers & Chemistry.

chester94.ps
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K.Hofmann and P. Bucher (1994)
Benefits of a Generalized Profile Syntax for Biomolecular Sequence Motifs.
Poster presented at the 3rd conference on Genes, Proteins and Computers (GPC3)
Chester/UK 1994

ismb96.ps
=========
P. Bucher and K. Hofmann (1996)
A Sequence Similarity Search Algorithm Based on a Probabilistic Interpretaion
of an Alignment Scoring System.
in: Proceedings of the 4th International Conference on Intelligent Systems in Molecular Biology. 
AAAI press, Menlo Park (CA)