{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,28]],"date-time":"2026-02-28T13:15:00Z","timestamp":1772284500743,"version":"3.50.1"},"reference-count":19,"publisher":"World Scientific Pub Co Pte Lt","issue":"11","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Int. J. Bifurcation Chaos"],"published-print":{"date-parts":[[2004,11]]},"abstract":"<jats:p> In this paper, we consider the following nonlinear differential equation [Formula: see text] We first consider the existence of local Hopf bifurcations, and then derive the explicit formulas which determine the stability, direction and other properties of bifurcating periodic solutions, using the normal form theory and center manifold reduction. Further, particular attention is focused on the existence of the global Hopf bifurcation. By using the global Hopf bifurcation theory due to Wu [1998], we show that the local Hopf bifurcation of (1) implies the global Hopf bifurcation after the second critical value of the delay \u03c4. Finally, numerical simulation results are given to support the theoretical predictions. <\/jats:p>","DOI":"10.1142\/s0218127404011697","type":"journal-article","created":{"date-parts":[[2005,3,11]],"date-time":"2005-03-11T11:52:56Z","timestamp":1110541976000},"page":"3909-3919","source":"Crossref","is-referenced-by-count":42,"title":["LOCAL AND GLOBAL HOPF BIFURCATION IN A DELAYED HEMATOPOIESIS MODEL"],"prefix":"10.1142","volume":"14","author":[{"given":"YONGLI","family":"SONG","sequence":"first","affiliation":[{"name":"Department of Mathematics, Shanghai Jiaotong University, Shanghai 200240, P. R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"JUNJIE","family":"WEI","sequence":"additional","affiliation":[{"name":"Department of Mathematics, Harbin Institute of Technology, Harbin, Heilongjiang 150001, P. R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"MAOAN","family":"HAN","sequence":"additional","affiliation":[{"name":"Department of Mathematics, Shanghai Jiaotong University, Shanghai 200240, P. R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"219","published-online":{"date-parts":[[2011,11,20]]},"reference":[{"key":"rf1","doi-asserted-by":"publisher","DOI":"10.1016\/0022-0396(74)90084-9"},{"key":"rf2","first-page":"425","volume":"273","author":"Giannakopoulos F.","journal-title":"J. Math. Anal. 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