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2nd-order differential-equations (1) |
fixed point theorem in cones (1) |
leray-schauder alternative (1) |
n-body-type (1) |
positive solution (1) |
superlinear singular periodic problem (1) |
2nd-order differential-equations (1) |
fixed point theorem in cones (1) |
leray-schauder alternative (1) |
n-body-type (1) |
positive solution (1) |
superlinear singular periodic problem (1) |