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Bakker de, Jacobus W. Max Planck Society;
van Leeuwen, Jan Max Planck Society;
Mehlhorn, K. (1980). Pebbling Mountain Ranges and its Application of DCFL-Recognition. In Automata, languages and programming (ICALP-80): 7th annual international colloquium (pp. 422-435). Berlin, Germany: Springer.