On Catalan's problem
K. Inkeri (1964)
Acta Arithmetica
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K. Inkeri (1964)
Acta Arithmetica
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Maurice Craig (1973)
Acta Arithmetica
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Andrzej Schinzel, J. Wójcik (1971)
Acta Arithmetica
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Ronald Evans (1981)
Acta Arithmetica
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Jerzy Urbanowicz (1983)
Acta Arithmetica
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Kenneth Williams, Kenneth Hardy (1985)
Acta Arithmetica
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R. Hudson, Kenneth Williams (1982)
Acta Arithmetica
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