// Update any formulas on this sheet that point to
// rows which have been moved
int sheetIndex = workbook.getSheetIndex(this);
short externSheetIndex = book.checkExternSheet(sheetIndex);
FormulaShifter shifter = FormulaShifter.createForRowShift(externSheetIndex, startRow, endRow, n);
sheet.updateFormulasAfterCellShift(shifter, externSheetIndex);
int nSheets = workbook.getNumberOfSheets();
for(int i=0; i<nSheets; i++) {
Sheet otherSheet = workbook.getSheetAt(i).getSheet();