@article{10_4064_cm87_1_9,
     author = {S. Thangavelu},
     title = {An analogue of {Hardy's} theorem for 
the {Heisenberg} group},
     journal = {Colloquium Mathematicum},
     pages = {137--145},
     publisher = {mathdoc},
     volume = {87},
     number = {1},
     year = {2001},
     doi = {10.4064/cm87-1-9},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm87-1-9/}
}