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References:
[1] Bar-Hillel Y., Gaifman C., Shamir E.: On categorial and phrase-structure grammars. Bull. Res. Counc. of Israel, Vol. 9F, 1960. MR 0136014 | Zbl 0158.25306
[2] Burris S., Sankappanavar H. P.: A course to universal algebra. Springer-Verlag, New York, 1981. MR 0648287
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