Adaptive Content Mapping for Internet Navigation; Hierarchical navigation and the zoomable user interface; http://www.informatik.uni-frankfurt.de/asa/papers/Chapter2-Hades.pdf appeared in Internet-Based Intelligent Information Processing Systems, World Scientific,
Singapore, pp.25-65, 2003.

View Small Things On Your Computer Screen Through A Virtual Magnification Glass http://www.masternewmedia.org/2003/03/31/view_small_things_on_your_computer_screen_through_a_virtual_magnification_glass.htm