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Shanta Laishram, T. N. Shorey (2008)
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J.H.E. Cohn (1983)
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Acta Arithmetica
Florian Luca, P. G. Walsh (2001)
Acta Arithmetica
Pingzhi Yuan, Yuan Li (2009)
Acta Arithmetica
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Integers
R. Balasubramanian, T. N. Shorey (1993)
Acta Arithmetica
Shanta Laishram, T. N. Shorey, Szabolcs Tengely (2008)
Acta Arithmetica
N. Saradha (1998)
Acta Arithmetica
Christoph Kirfel (1988)
Acta Arithmetica
Takashi Agoh (1998)
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Jean-Marc Deshouillers (1990)
Journal de théorie des nombres de Bordeaux
E. Morgantini (1952)
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Ted Chinburg, Melvin Henriksen (1976)
Acta Arithmetica
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Jörg Brüdern (2014)
Bulletin of the Polish Academy of Sciences. Mathematics
Asymptotic formulae are provided for the number of representations of a natural number as the sum of four and of three squares that are pairwise coprime.
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C.M. Skinner, T.D. Wooley (1995)
Journal für die reine und angewandte Mathematik