1. D.J. Abel. Some Elemental Operations on linear Quadtrees for Geographic Information Systems. The Computer journal, 28(1):73--77 , 1985.
   

   @Article{Abe85,
   
    author = {Abel, D.J.},
   
    title = {{Some Elemental Operations on linear Quadtrees for Geographic Information Systems}},
   
    journal = {The Computer journal},
   
    year = {1985},
   
    volume = {28},
   
    number = {1},
   
    pages = {73--77}
    
   }

2. F.W. Burton, M.M. Huntbach, and J.Y.G. Kollias. Multiple Generation Text Files Using Overlapping Tree Structures. The Computer Journal, 28(4):414--416 , Aug. 1985.
   

   @Article{BHK85,
   
    author = {Burton, F.W. and Huntbach, M.M. and Kollias, J.Y.G.},
   
    title = {{Multiple Generation Text Files Using Overlapping Tree
    Structures}},
   
    journal = {The Computer Journal},
   
    year = {1985},
   
    volume = {28},
   
    number = {4},
   
    month = {Aug.},
   
    pages = {414--416}
    
   }

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