1. Cyclic Difference Sets;Baumert,1971
2. Algèbre de Hadamard;Benzaghou;Bull. Soc. Math. France,1969
3. On the divisors of second order recurrence;Catlin;Fibonnacci Quarterly,1974
4. Algebraic Number Fields;Janusz,1973
5. Divisibility properties of second order recurrence;Kiss;Publicationes Mathematicae,1979