int rownum = getRowNum() + n;
for(Cell c : this){
XSSFCell cell = (XSSFCell)c;
//remove the reference in the calculation chain
if(calcChain != null) calcChain.removeItem((int)sheet.sheet.getSheetId(), cell.getReference());
CTCell ctCell = cell.getCTCell();
String r = new CellReference(rownum, cell.getColumnIndex()).formatAsString();
ctCell.setR(r);