“…First of all, it is known that h has the Northcott or Bogomolov property, when restricted to suitable sub-fields of Q having infinite degree over Q. We refer the interested reader to [16,29,30,46,51,139] for the study of fields having the Northcott property, and to [3,4,16,53,54,56,64,72,115,119] for the study of fields having the Bogomolov one. Moreover, it has also been shown that many fields F Â Q do not have the Bogomolov property.…”