diff --git a/core-java/README.md b/core-java/README.md
index 627535d1e5..ce2d5b3e64 100644
--- a/core-java/README.md
+++ b/core-java/README.md
@@ -17,12 +17,9 @@
 - [Sorting in Java](http://www.baeldung.com/java-sorting)
 - [Getting Started with Java Properties](http://www.baeldung.com/java-properties)
 - [Grep in Java](http://www.baeldung.com/grep-in-java)
-- [Simulated Annealing for Travelling Salesman Problem](http://www.baeldung.com/java-simulated-annealing-for-traveling-salesman)
-- [Slope One Algorithm: Collaborative Filtering Recommendation Systems](http://www.baeldung.com/java-collaborative-filtering-recommendations)
 - [Pattern Search with Grep in Java](http://www.baeldung.com/grep-in-java)
 - [URL Encoding and Decoding in Java](http://www.baeldung.com/java-url-encoding-decoding)
 - [The Basics of Java Generics](http://www.baeldung.com/java-generics)
-- [The Traveling Salesman Problem in Java](http://www.baeldung.com/java-simulated-annealing-for-traveling-salesman)
 - [How to Create an Executable JAR with Maven](http://www.baeldung.com/executable-jar-with-maven)
 - [How to Design a Genetic Algorithm in Java](http://www.baeldung.com/java-genetic-algorithm)
 - [Basic Introduction to JMX](http://www.baeldung.com/java-management-extensions)