Stability of periodically time-varying systems: Periodic Lyapunov functions. Böhm, C., Lazar, M., & Allgöwer, F. Automatica, 48(10):2663-2669, 2012.
bibtex   
@ARTICLE{ist:bohm12a,
  author = {B{\"o}hm, C. and Lazar, M. and Allg{\"o}wer, F.},
  title = {Stability of periodically time-varying systems: {P}eriodic {L}yapunov
	functions},
  journal = {Automatica},
  year = {2012},
  volume = {48},
  pages = {2663-2669},
  number = {10},
  pubtype = {journal}
}

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