@article{AIF_1990__40_2_313_0, author = {Garofalo, Nicola and Lanconelli, Ermanno}, title = {Frequency functions on the {Heisenberg} group, the uncertainty principle and unique continuation}, journal = {Annales de l'Institut Fourier}, pages = {313--356}, publisher = {Institut Fourier}, address = {Grenoble}, volume = {40}, number = {2}, year = {1990}, doi = {10.5802/aif.1215}, zbl = {0694.22003}, mrnumber = {91i:22014}, language = {en}, url = {https://aif.centre-mersenne.org/articles/10.5802/aif.1215/} }