https://www.nist.gov/publications/bifurcations-center-manifolds-and-periodic-solutions
Nonlinear time delay differential equations are well known to have arisen in models in physiology, biology, and population dynamics.
periodic solutionsbifurcationscentermanifoldsnist
https://scirp.org/journal/papercitationdetails?paperid=33396&JournalID=1003
In this paper, by using the contraction mapping principle and constructing a suitable Lyapunov functional, we established a set of easily applicable criteria...
almost periodicexistenceuniquenesspositivesolutions