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The first author was partially supported by MURST, Italy (40% and 60%) and GNAFA of CNR, Italy
The second author was partially supported by the European program GADGET
The third author was partially supported by NSF Grant # DMS91-04195
The first and third authors were also partially supported by a bilateral CNR-NSF project
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Franchi, B., Gallot, S. & Wheeden, R.L. Sobolev and isoperimetric inequalities for degenerate metrics. Math. Ann. 300, 557–571 (1994). https://doi.org/10.1007/BF01450501
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DOI: https://doi.org/10.1007/BF01450501