public Ptg get3DReferencePtg(CellReference cr, SheetIdentifier sheet) {int extIx = getSheetExtIx(sheet);return new Ref3DPtg(cr, extIx);}

public Ptg Get3DReferencePtg(CellReference cr, SheetIdentifier sheet){int extIx = GetSheetExtIx(sheet);return new Ref3DPtg(cr, extIx);}
