@article{MET_1974__21_175622,
     author = {H.J. Lenz},
     title = {Spektralanalytische {Sch\"atzung} linearer dynamischer {Systeme} -  {WOLTERS,} {J.}},
     journal = {Metrika},
     pages = {52--53},
     publisher = {mathdoc},
     volume = {21},
     year = {1974},
     url = {http://geodesic.mathdoc.fr/item/MET_1974__21_175622/}
}