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    Classification of Quad-encoding Techniques
    (Blackwell Science Ltd and the Eurographics Association, 1991) Hunter, Andrew; Willis, Philip
    Many quad encoding technique have been published previously, using a variety of approaches to the different facets of quad storage, representation and manipulation. We review the major classes and identify three parameters which distinguish them. These are then used explicitly to classify a large number of published methods, with short discussion on each. In doing this we are also able to highlight some new approaches, to identify rare examples which escape the classification, and to suggest approaches to choosing a method to suit a given application.
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    A Picture Archive Browser
    (Blackwell Science Ltd and the Eurographics Association, 1991) Willis, Philip; Hunter, Andrew
    We describe an implementation of a networked picture browser. The system offers a pictorial interface to pictorial data, relieves the users of thinking about the underlying filing system, provides managerial tools for installing, moving and deleting pictures, offers graded access and picture sharing and supports a number of picture formats, including hierarchical encodings.