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Link to original content: https://dblp.org/rec/journals/jam/LiuT13a.xml
Xin-Ge Liu Mei-Lan Tang Lower Bounds of Periods of Periodic Solutions for a Class of Differential Equations with Variable Delays. 2013 2013 J. Appl. Math. https://doi.org/10.1155/2013/896168 https://www.wikidata.org/entity/Q59005086 db/journals/jam/jam2013.html#LiuT13a 896168:1-896168:3