@article{10_4064_sm216_3_1,
     author = {Lashi Bandara and A. F. M. ter Elst and Alan McIntosh},
     title = {Square roots of perturbed subelliptic
 operators on {Lie} groups},
     journal = {Studia Mathematica},
     pages = {193--217},
     publisher = {mathdoc},
     volume = {216},
     number = {3},
     year = {2013},
     doi = {10.4064/sm216-3-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/sm216-3-1/}
}