diff --git a/src/core/article.cpp b/src/core/article.cpp
index 3270da7..b56c413 100644
--- a/src/core/article.cpp
+++ b/src/core/article.cpp
@@ -10,8 +10,10 @@ void Article::setPrice(int price) { price_ = price; }
 
 void Article::setDescription(const std::string& description) { description_ = description; }
 
-std::string Article::getDescription() { return description_; }
-
 void Article::setSale(std::shared_ptr<Sale> salePtr) { salePtr_ = salePtr; }
 
-bool Article::isSold() { return salePtr_ ? true : false; }
\ No newline at end of file
+bool Article::isSold() { return salePtr_ ? true : false; }
+
+std::string Article::getDescription() { return description_; }
+
+Seller* Article::getSeller() { return sellerPtr_.get(); }
\ No newline at end of file
diff --git a/src/core/article.h b/src/core/article.h
index 1d0487b..4042924 100644
--- a/src/core/article.h
+++ b/src/core/article.h
@@ -18,11 +18,13 @@ class Article : public Entity
     void setArticleNo(int articleNo);
     void setPrice(int price);
     void setDescription(const std::string& description);
-    std::string getDescription();
     bool isSold();
     void setSale(std::shared_ptr<Sale> salePtr);
     void setSeller(std::shared_ptr<Seller> sellerPtr);
 
+    std::string getDescription();
+    Seller* getSeller();
+
   private:
     std::shared_ptr<Seller> sellerPtr_{};
     std::shared_ptr<Sale> salePtr_{};
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};