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Current Trends in Theoretical Computer Science
The problem proposed by Gauss of characterizing the code of a simple crossing closed curve (SCCC, for short) can be considered a formal language question. We define three related infinite languages. Two of them are regular; the type of the third is an open problem.doi:10.1142/9789812794499_0041 dblp:series/wsscs/KariMPS93 fatcat:hpu3weoac5dhjms3iso45a46iu