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+Before disabling any content in relation to this takedown notice, GitHub  
+- contacted the owners of some or all of the affected repositories to give them an opportunity to [make changes](https://docs.github.com/en/github/site-policy/dmca-takedown-policy#a-how-does-this-actually-work).  
+- provided information on how to [submit a DMCA Counter Notice](https://docs.github.com/en/articles/guide-to-submitting-a-dmca-counter-notice).  
+  
+To learn about when and why GitHub may process some notices this way, please visit our [README](https://github.com/github/dmca/blob/master/README.md#anatomy-of-a-takedown-notice).  
+  
+---  
+  
+Dear Sir/Madam,  
+  
+   
+  
+I hereby state under penalty of perjury that I am authorized to act on behalf of John Wiley & Sons,. (hereinafter “John Wiley & Sons,”). John Wiley & Sons, is the exclusive owner of several intellectual property rights, including certain copyrights on all material distributed by John Wiley & Sons, and used on its homepage John Wiley & Sons,.com.  
+  
+  
+On behalf of our client John Wiley & Sons,., with its principal place of business at [private] (hereinafter “John Wiley & Sons,”), I hereby inform you as follows:  
+  
+   
+  
+I am the owner, or an agent authorized to act on behalf of the owner, of certain intellectual property rights ("IP Owner"); John Wiley & Sons,.  
+  
+I have a good faith belief that the advertisement(s) as mentioned below offer items or contain materials that, according to applicable legislation, infringe the IP Owner's rights;  
+  
+The information in this declaration is true and correct.  
+  
+I have taken fair use into consideration.  
+  
+I have read and understand GitHub's Guide to Filing a DMCA Notice.  
+  
+   
+  
+John Wiley & Sons, is the exclusive owner of several intellectual property rights, including certain copyrights on all material distributed by John Wiley & Sons, and used on its homepage John Wiley & Sons,.com.  
+  
+   
+  
+Recently it has come to my attention that the website github.com contains unauthorized use of John Wiley & Sons,'s copyrights. I have a good faith belief that the use of John Wiley & Sons,'s copyrighted work on github.com is not authorized by John Wiley & Sons,, by any agent of John Wiley & Sons,, or by law. Such use constitutes copyright infringement.  
+  
+   
+  
+   
+  
+The infringing URLs are identified as:  
+https://github.com/liuzhenboo/optimal-estimation-course/blob/master/Estimation%20with%20Applications%20to%20Tracking%20and%20Navigation.pdf  
+  
+  
+Link to the original work:  
+  
+https://onlinelibrary.wiley.com/doi/book/10.1002/0471221279  
+  
+Kindly refer to the official Wiley website for more information - https://www.wiley.com  
+  
+  
+  
+I kindly request that you please remove the content as soon as possible. In case you do not comply with this request, John Wiley & Sons, reserves all the rights to take further action.  
+  
+  
+Sincerely,  
+  
+[private],  
+Corsearch B.V.,  
+On behalf of John Wiley & Sons,,  
+  
+[private]  
+  
+Phone: [private]