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- [2] EQUATION PHI(Z)=PHI1(X)+PHI2(Y)+PHI3(X+Y) [J]. DOKLADY AKADEMII NAUK SSSR, 1973, 210 (04): : 753 - 755
- [7] EULER EQUATION PHI(X)=K WITH NO SOLUTION [J]. JOURNAL OF NUMBER THEORY, 1989, 32 (02) : 254 - 256
- [8] EQUATION PHI (X) = K [J]. NOTICES OF THE AMERICAN MATHEMATICAL SOCIETY, 1975, 22 (02): : A297 - A297