The existence of periodic solutions for some models with delay

• Authors:

• Xianzhang Wen;Zhicheng Wang

• Affiliations:

• Department of Mathematics, Hunan Normal University, Changsha 410081, Hunan, People's Republic of China;Department of Applied Mathematics, Hunan University, Changsha 410082, Hunan, People's Republic of China

• Venue:
• Nonlinear Analysis: Real World Applications
• Year:
• 2002