@article{MET_1975__22_175668,
     author = {W. B\"uhler and T. Deutler},
     title = {Optimal {Stratification} and {Grouping} by {Dynamic} {Programming.}},
     journal = {Metrika},
     pages = {161--176},
     publisher = {mathdoc},
     volume = {22},
     year = {1975},
     zbl = {0321.62012},
     url = {http://geodesic.mathdoc.fr/item/MET_1975__22_175668/}
}