@article{10_4064_ap86_2_5,
     author = {Bingwen Liu and Lihong Huang},
     title = {Periodic solutions for some delay differential equations
 appearing in models of power systems},
     journal = {Annales Polonici Mathematici},
     pages = {153--164},
     publisher = {mathdoc},
     volume = {86},
     number = {2},
     year = {2005},
     doi = {10.4064/ap86-2-5},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap86-2-5/}
}