public function getArticle($articleNumber)
    {
        $requestData = new Get\RequestData();
        $requestData->setArticleNumber($articleNumber);

        $request = new Get\Request($requestData);
        $request->setLimit(1);

        /** @var Get\ApiResponse $apiResponse */
        $apiResponse = $this->sendRequest($request, Get\ApiResponse::class);
        $articles = $apiResponse->getResponse()->getArticles();

        return isset($articles[0]) ? $articles[0] : null;
    }