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Unnikrishnan, A and Shankar, Priti and Venkatesh, YV (1988) Threaded Linear Hierarchical Quadtrees for Computation of Geometric Properties of Binary Images. In: IEEE Transactions on Software Engineering, 14 (5). pp. 659-665.
Unnikrishnan, A and Venkatesh, YV and Shankar, P (1987) Distribution of black nodes at various levels in a linear quadtree. In: Pattern Recognition Letters, 6 (5). pp. 341-342.