def ref=(cell_reference)
      cell_reference = cell_reference.r if cell_reference.is_a?(Cell)
      Axlsx::validate_string cell_reference
      @ref = cell_reference
    end
def ref=(cell_reference)
      cell_reference = cell_reference.r if cell_reference.is_a?(Cell)
      Axlsx::validate_string cell_reference
      @ref = cell_reference
    end
Sets the cell location of this hyperlink in the worksheet
 @param [String|Cell] cell_reference The string reference or cell that defines where this hyperlink shows in the worksheet.