%0 Journal Article %A Kaparin, Vadim %A Kotta, Ülle %T Transformation of nonlinear state equations into the observer form: Necessary and sufficient conditions in terms of one-forms %J Kybernetika %D 2015 %P 36-58 %V 51 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.14736/kyb-2015-1-0036/ %R 10.14736/kyb-2015-1-0036 %G en %F 10_14736_kyb_2015_1_0036