diff --git a/src/core/seller.cpp b/src/core/seller.cpp
index 5e7edae..94d3a0d 100644
--- a/src/core/seller.cpp
+++ b/src/core/seller.cpp
@@ -30,15 +30,17 @@ std::string Seller::getLastName() const { return lastName_; }
 
 int Seller::getSellerNo() const { return sellerNo_; }
 
-std::vector<std::shared_ptr<Article>> Seller::getArticles(bool onlySold)
+std::vector<Article*> Seller::getArticles(bool onlySold) const
 {
-    std::vector<std::shared_ptr<Article>> articles;
+    std::vector<Article*> articles;
     for (const auto article : articles_) {
         if (onlySold && article->isSold()) {
-            articles.push_back(article);
+            articles.push_back(article.get());
         } else if (!onlySold) {
-            articles.push_back(article);
+            articles.push_back(article.get());
         }
     }
     return articles;
-}
\ No newline at end of file
+}
+
+size_t Seller::soldArticles() const { return getArticles(true).size(); }
\ No newline at end of file
diff --git a/src/core/seller.h b/src/core/seller.h
index 63aebb2..a713292 100644
--- a/src/core/seller.h
+++ b/src/core/seller.h
@@ -27,7 +27,8 @@ class Seller : public Entity
     std::string getLastName() const;
     int getSellerNo() const;
     int getNumberOfOfferedArticles() const;
-    std::vector<std::shared_ptr<Article>> getArticles(bool onlySold = false);
+    size_t soldArticles() const;
+    std::vector<Article*> getArticles(bool onlySold = false) const;
 
   private:
     int sellerNo_{-1};