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- [34] AN IMPOSSIBLE REPRESENTATION OF FUNCTION F(X,Y)=XY AMERICAN MATHEMATICAL MONTHLY, 1968, 75 (10): : 1122 - &
- [36] NOTES ON THE SOLUTION OF THE EQUATION Y''-XY=F(X) QUARTERLY JOURNAL OF MECHANICS AND APPLIED MATHEMATICS, 1950, 3 (01): : 112 - 118
- [37] SAMPLING FOR SIMULTANEOUS ANALYSIS OF X,Y AND XY EVENTS REVUE DE PHYSIQUE APPLIQUEE, 1969, 4 (02): : 143 - +