Adimurthi and Mallick, A. 2018. A Hardy type inequality on fractional order Sobolev spaces on the Heisenberg group. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE. 18, 3 (May 2018), 917-949. DOI:https://doi.org/10.2422/2036-2145.201604_010.