diff --git a/Algorithm/AI/Haar_Classifier.md b/Algorithm/AI/Haar_Classifier.md
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@@ -3,4 +3,7 @@
 ## 参考
 
 [人脸检测之Haar分类器](https://www.cnblogs.com/zyly/p/9410563.html)  
+[What’s the Difference Between Haar-Feature Classifiers and Convolutional Neural Networks?](https://towardsdatascience.com/whats-the-difference-between-haar-feature-classifiers-and-convolutional-neural-networks-ce6828343aeb)  
+[Computer Vision — Detecting objects using Haar Cascade Classifier](https://towardsdatascience.com/computer-vision-detecting-objects-using-haar-cascade-classifier-4585472829a9)  
+[Deep Learning Haar Cascade Explained](http://www.willberger.org/cascade-haar-explained/)  
 [浅析人脸检测之Haar分类器方法：Haar特征、积分图、AdaBoost、级联](https://blog.csdn.net/zouxy09/article/details/7922923)