Add links to readme

README.md

@@ -11,19 +11,19 @@ The paper is written in Serbian (Eksploatacija_propusta_u_pametnim_ugovorima.pdf
 
 1. NFT Auction
 	* Implementation of auction that has reentrancy vulnerability
-	* Inspired by DAO hack
+	* Inspired by [DAO hack](https://hackingdistributed.com/2016/06/18/analysis-of-the-dao-exploit/)
 		
 2. Hyperinflation
 	* Smart contract that has half implementation of ERC20 contract with overflow vulnerability
 	* Exploitation of this vulnerability leads to hyperinflation of token
-	* Inspired by BEC (BeutyChain) hack
+	* Inspired by [BEC (BeutyChain) hack](https://medium.com/secbit-media/a-disastrous-vulnerability-found-in-smart-contracts-of-beautychain-bec-dbf24ddbc30e)
 
 3. Ether chest
 	* Smart contract that enables users to lock their Eth for some time
 	* To exploit this contract attacker needs to combine reentracny, overflow and underflow vulnerabilities
 
 4. King of Ether
-	* Famous king of ether game with additional protection (checks if caller is smart contract and if it is stops function call)
+	* Famous [king of ether game](https://www.kingoftheether.com/thrones/kingoftheether/index.html) with additional protection (checks if caller is smart contract and if it is stops function call)
 	* Example of Denial of Service (DOS) attack
 
 5. Giveaway
@@ -48,7 +48,7 @@ Instructions for running each example is in readme inside each example directori
 	* use commitment schemes with separate phases: first commit using the hash of the values and in a later phase revealing the values
 * Limit the maximum number of Eth that contract can accept (if possible)
 
-* More useful recommendations [here](https://consensys.github.io/smart-contract-best-practices/)
+More useful recommendations [here](https://consensys.github.io/smart-contract-best-practices/)
 
 ## Smart contract security tools
 
@@ -69,3 +69,4 @@ If you see any mistake or have improvement idea, feel free to open an issue and
 ## License
 
 [![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
+