@article{MZ_1968__103_170898,
     author = {Wolfgang Krieger},
     title = {On the {Isomorphy} {Problem} for {Ergodic} {Equivalence} {Relations.}},
     journal = {Mathematische Zeitschrift},
     pages = {78--84},
     publisher = {mathdoc},
     volume = {103},
     year = {1968},
     zbl = {0177.30902},
     url = {http://geodesic.mathdoc.fr/item/MZ_1968__103_170898/}
}