{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,9,20]],"date-time":"2025-09-20T19:41:08Z","timestamp":1758397268559,"version":"3.37.3"},"reference-count":17,"publisher":"World Scientific Pub Co Pte Ltd","issue":"14","funder":[{"DOI":"10.13039\/501100001809","name":"the National Natural Science Foundations of China","doi-asserted-by":"crossref","award":["61179031"],"award-info":[{"award-number":["61179031"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"crossref"}]},{"name":"the National Science Foundations of China","award":["11601493"],"award-info":[{"award-number":["11601493"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Int. J. Bifurcation Chaos"],"published-print":{"date-parts":[[2019,12,30]]},"abstract":"<jats:p> In this paper, we study the periodic solutions of high order differential delay equations with [Formula: see text] lags. And the [Formula: see text]-periodic solutions are obtained by using the variational method and the method of Kaplan\u2013Yorke coupling system. This is a new type of differential delay equations compared with all previous researches. And it provides a theoretical basis for the study of differential delay equations. An example is given to demonstrate our main results. <\/jats:p>","DOI":"10.1142\/s0218127419501967","type":"journal-article","created":{"date-parts":[[2019,12,26]],"date-time":"2019-12-26T04:36:48Z","timestamp":1577335008000},"page":"1950196","source":"Crossref","is-referenced-by-count":8,"title":["On the Number of Periodic Solutions to Kaplan\u2013Yorke-like High Order Differential Delay Equations with 2k Lags"],"prefix":"10.1142","volume":"29","author":[{"given":"Lin","family":"Li","sequence":"first","affiliation":[{"name":"Department of Mathematices, Beijing Institute of Technology, Beijing 100081, P. R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8243-7887","authenticated-orcid":false,"given":"Huafei","family":"Sun","sequence":"additional","affiliation":[{"name":"Department of Mathematices, Beijing Institute of Technology, Beijing 100081, P. R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Weigao","family":"Ge","sequence":"additional","affiliation":[{"name":"Department of Mathematices, Beijing Institute of Technology, Beijing 100081, P. R. 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