private BSTNode<T> searchAux(T element, BSTNode<T> node) {
		BSTNode<T> out = new BSTNode<T>();
		if (node.isEmpty())
			out = node;
		else {
			if (element.equals(node.getData())) {
				out = node;
			} else {
				if (element.compareTo(node.getData()) > 0) {
					return searchAux(element, (BSTNode<T>) node.getRight());
				} else {
					return searchAux(element, (BSTNode<T>) node.getLeft());
				}
			}
		}
		return out;
	}