@article{10_4064_sm_73_1_41_49,
     author = {Stefan Heinrich},
     title = {The isomorphic problem of envelopes},
     journal = {Studia Mathematica},
     pages = {41--49},
     publisher = {mathdoc},
     volume = {73},
     number = {1},
     year = {1982},
     doi = {10.4064/sm-73-1-41-49},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm-73-1-41-49/}
}