http://www.ivorcatt.co.uk/x65v.htm

http://ieeexplore.ieee.org/search/searchresult.jsp?matchBoolean=true&newsearch=true&searchWithin=p_First_Names:ivor&searchWithin=p_Last_Names:catt

http://www.ivorcatt.org/digital-hardware-design.htm

http://www.ivorcatt.co.uk/x147.pdf

http://www.ivorcatt.co.uk/x22k1.pdf

http://www.ivorcatt.co.uk/x18j1.htm