%0 Journal Article %A Sontag, Eduardo D. %T Clocks and insensitivity to small measurement errors %J ESAIM: Control, Optimisation and Calculus of Variations %D 1999 %P 537-557 %V 4 %I EDP-Sciences %U http://www.numdam.org/item/COCV_1999__4__537_0/ %G en %F COCV_1999__4__537_0