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@Article{Soisalon-Soininen:1979:CPL, author = "E. Soisalon-Soininen", title = "On the covering problem for left-recursive grammars", journal = j-THEOR-COMP-SCI, volume = "8", number = "1", pages = "1--11", month = feb, year = "1979", CODEN = "TCSCDI", ISSN = "0304-3975 (print), 1879-2294 (electronic)", ISSN-L = "0304-3975", bibdate = "Sat Nov 22 13:36:07 MST 1997", bibsource = "http://www.math.utah.edu/pub/tex/bib/tcs1975.bib", acknowledgement = ack-nhfb, classification = "C4210 (Formal logic)", corpsource = "Dept. of Computer Sci., Univ. of Helsinki, Helsinki, Finland", fjournal = "Theoretical Computer Science", journal-URL = "http://www.sciencedirect.com/science/journal/03043975/", keywords = "covering problem; grammars; left recursion", pubcountry = "Netherlands", treatment = "T Theoretical or Mathematical", }