http://ir.sinica.edu.tw/handle/201000000A/35905
Title: | A note on periodic solutions in the vicinity of a center | Authors: | Du, Bau-Sen | Issue Date: | 1981 | Relation: | Proc. Amer. Math. Soc. 81(4), 579-584 | URI: | http://ir.sinica.edu.tw/handle/201000000A/35905 |
Appears in Collections: | 數學研究所 |
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