@article{MET_1998__47_2_176757,
     author = {T. Ryd\'en},
     title = {Asymptotically {Efficient} {Recursive} {Estimation} for {Incomplete} {Data} {Models} {Using} the {Observed} {Information.}},
     journal = {Metrika},
     pages = {119--146},
     publisher = {mathdoc},
     volume = {47},
     number = {2},
     year = {1998},
     zbl = {1093.62523},
     url = {http://geodesic.mathdoc.fr/item/MET_1998__47_2_176757/}
}