function CellReference() {
    (0, _classCallCheck2.default)(this, CellReference);
    return (0, _possibleConstructorReturn2.default)(this, (0, _getPrototypeOf2.default)(CellReference).apply(this, arguments));
  }
Class which indicates formula expression precedents cells at specified cell
coordinates (CellValue). This object uses visual cell coordinates.

@class CellReference
@util