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)* d. j. bernstein, "enumerating solutions to p(a) + q(b) = r(c) + s(d)", "mathematics of computation" 70, 233 (2000), 389–394.
)* d. j. bernstein, "enumerating solutions to p(a) + q(b) = r(c) + s(d)", "mathematics of computation" 70, 233 (2000), 389–394.