@article{MOMA_1986__101_178275,
     author = {Fulvio Ricci},
     title = {A {Contraction} of {S} {U} (2) to the {Heisenberg} {Group.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {211--226},
     year = {1986},
     volume = {101},
     zbl = {0588.43007},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1986__101_178275/}
}