Estimates of periods and global continua of periodic solutions for state-dependent delay equations. Hu, Q., Wu, J., & Zou, X. SIAM J. Math. Anal., 44(4):2401--2427, 2012. Journal link.
doi  bibtex   
@article{ MR3023381,
  author = {Hu, Qingwen and Wu, Jianhong and Zou, Xingfu},
  title = {Estimates of periods and global continua of periodic solutions
              for state-dependent delay equations},
  journal = {SIAM J. Math. Anal.},
  fjournal = {SIAM Journal on Mathematical Analysis},
  volume = {44},
  year = {2012},
  number = {4},
  pages = {2401--2427},
  issn = {0036-1410},
  coden = {SJMAAH},
  mrclass = {34K18 (34K13 37G15)},
  mrnumber = {3023381},
  mrreviewer = {Alessandro Calamai},
  doi = {10.1137/100793712},
  bibbase_note = {<a href="http://dx.doi.org/10.1137/100793712" target="_blank">
<span style="color: green">Journal link</span></A>.}
}

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