@article{MS2_1968__22_166048,
     author = {Borge Jessen},
     title = {The {Algebra} of {Polyhedra} and the {Dehn-Sydler} {Theorem.}},
     journal = {Mathematica Scandinavica},
     pages = {241--256},
     publisher = {mathdoc},
     volume = {22},
     year = {1968},
     zbl = {0183.49803},
     url = {http://geodesic.mathdoc.fr/item/MS2_1968__22_166048/}
}