RT Journal T1 Multiplicity of periodic solution of a class of non-automous second order system A1 ZHANG Shen-gui PB JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) FD 2011-11-20 YR 2011 JF JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) JO JOURNAL OF SHANDONG UNIVERSITY(NATURAL SCIENCE) VO 46 IS 11 SP 64 DO K1

second order system; linear nonlinearity; partially periodic; periodic solution; critical point

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