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[4] Hart P., Nilsson N., Raphael B.: A formal basis for the heuristic determination of minimum cost paths. I.E.E.E, Trans. on Sys. Sci. and Cybernetics 4 (1968), 2, 100-107.
[5] Michie D., Ross R.:
Experiments with the Adaptive Graph Traverser. Machine Intelligence 5 (eds. B. Meltzer, D. Michie). Edinburgh University Press, Edinburgh 1970.
MR 0258327
[6] Pohl I.:
First results on the effect of error in heuristic search. Machine Intelligence 5 (eds. B. Meltzer, D. Michie). Edinburgh University Press, Edinburgh 1970.
MR 0292343