@article{10_1017_S0017089504002034,
     author = {NIU, PENGCHENG and CHEN, YANXIA and HAN, YAZHOU},
     title = {SOME {HARDY-TYPE} {INEQUALITIES} {FOR} {THE} {GENERALIZED} {BAOUENDI-GRUSHIN} {OPERATORS}},
     journal = {Glasgow mathematical journal},
     pages = {515--527},
     year = {2004},
     volume = {46},
     number = {3},
     doi = {10.1017/S0017089504002034},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089504002034/}
}