@article{CC_2005_34_3_a0,
     author = {Allwright, John and Vinter, Richard},
     title = {Second order conditions for periodic optimal control problems},
     journal = {Control and Cybernetics},
     pages = {617--643},
     publisher = {mathdoc},
     volume = {34},
     number = {3},
     year = {2005},
     zbl = {1167.49310},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CC_2005_34_3_a0/}
}