@article{10_4153_CMB_2007_029_6,
     author = {Sarkar, Rudra P. and Sengupta, Jyoti},
     title = {Beurling's {Theorem} and {Characterization} of {Heat} {Kernel} for {Riemannian} {Symmetric} {Spaces} of {Noncompact} {Type}},
     journal = {Canadian mathematical bulletin},
     pages = {291--312},
     year = {2007},
     volume = {50},
     number = {2},
     doi = {10.4153/CMB-2007-029-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2007-029-6/}
}