On A Problem Of Samuel
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Raj K. Markanda, Joaquin Pascual (1981)
Revista colombiana de matematicas
Ladislav Skula (1976)
Acta Arithmetica
Joe L. Mott, M. Zafrullah (1981)
Manuscripta mathematica
McCasland, R.L., Moore, Marion E. (1991)
Portugaliae mathematica
Steven Dale Cutkosky (1989)
Inventiones mathematicae
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