Wojciech Buszkowski, Maciej Farulewski. Nonassociative Lambek Calculus with Additives and Context-Free Languages. In Orna Grumberg, Michael Kaminski, Shmuel Katz, Shuly Wintner, editors, Languages: From Formal to Natural, Essays Dedicated to Nissim Francez on the Occasion of His 65th Birthday. Volume 5533 of Lecture Notes in Computer Science, pages 45-58, Springer, 2009. [doi]
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