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Chajda Ivan; Länger Helmut: A Cayley theorem for algebras with binary and miliary operations. In: Acta scientiarum mathematicarum, (75) 1-2. pp. 55-58. (2009)
Dorninger Dietmar W.; Länger Helmut: A formula for the solution of the difference equation : Xn+1=AX2n+BXn+C. In: Acta scientiarum mathematicarum, (47) 3-4. pp. 487-489. (1984)
