1. ALBERTS D.S. "The economics of software " in Future programming State of the Art Rep. Infotech. ALBERTS D.S. "The economics of software " in Future programming State of the Art Rep. Infotech.
2. Machine organization of a growing search tree;BERKOVICH S.;Dolk. Akad Nauk SSSR,1972
3. Extendible hashing—a fast access method for dynamic files
4. KWONG Y. S AND WOOD D T-trees" A variant of B-trees Tech. Rep 78-CS-18 MeMaster U. Hamilton Ont. Canada 1978. KWONG Y. S AND WOOD D T-trees" A variant of B-trees Tech. Rep 78-CS-18 MeMaster U. Hamilton Ont. Canada 1978.