Update README.md

README.md

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 ## Dataset Description
 
-- **[Homepage](https://ogb.stanford.edu/docs/graphprop/#ogbg-mol)**
-- **[Repository](https://github.com/snap-stanford/ogb):**: 
-- **Paper:**: Open Graph Benchmark: Datasets for Machine Learning on Graphs (see citation) 
+- **Homepage:** [Homepage](https://ogb.stanford.edu/docs/graphprop/#ogbg-mol)
+- **Repository:** [Repository](https://github.com/snap-stanford/ogb)  
+- **Paper:**: [Open Graph Benchmark: Datasets for Machine Learning on Graphs](https://proceedings.neurips.cc/paper/2020/hash/fb60d411a5c5b72b2e7d3527cfc84fd0-Abstract.html) (see citation) 
 - **Leaderboard:**: [OGB leaderboard](https://ogb.stanford.edu/docs/leader_graphprop/#ogbg-molpcba) and [Papers with code leaderboard](https://paperswithcode.com/sota/graph-property-prediction-on-ogbg-molpcba)
 
 ### Dataset Summary