@article{10_14736_kyb_2015_1_0036,
     author = {Kaparin, Vadim and Kotta, \"Ulle},
     title = {Transformation of nonlinear state equations into the observer form: {Necessary} and sufficient conditions in terms of one-forms},
     journal = {Kybernetika},
     pages = {36--58},
     publisher = {mathdoc},
     volume = {51},
     number = {1},
     year = {2015},
     doi = {10.14736/kyb-2015-1-0036},
     mrnumber = {3333832},
     zbl = {06433831},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.14736/kyb-2015-1-0036/}
}