Update README.md

README.md

@@ -58,19 +58,23 @@ methods used for text summarization will be described indvidually in the followi
 
 ## Methods
 
+Since there are many methods to choose from in order to perform the ATS task using this model, the following table presents useful information
+regarding each of them, such as what kind of ATS the method produces (extractive or abstractive), where to find the documentation necessary for 
+its implementation and the article from which it originated.
+
 | Method                 | Kind of ATS | Documentation   | Source Article |
 |:----------------------:|:-----------:|:---------------:|:--------------:|
 | SumyRandom             | Extractive  |   [Sumy GitHub](https://github.com/miso-belica/sumy/) | None (picks out random sentences from source text) |
-| SumyLuhn               | Extractive  |   Ibid.         | (Luhn, 1958) |
+| SumyLuhn               | Extractive  |   Ibid.         | [(Luhn, 1958)](http://www.di.ubi.pt/~jpaulo/competence/general/%281958%29Luhn.pdf) |
 | SumyLsa                | Extractive  |   Ibid.         | [(Steinberger et al., 2004)](http://www.kiv.zcu.cz/~jstein/publikace/isim2004.pdf) |
-| SumyLexRank            | Extractive  |   Ibid.         | (Erkan and Radev, 2004) |
-| SumyTextRank           | Extractive  |   Ibid.         | (Mihalcea and Tarau, 2004) |
-| SumySumBasic           | Extractive  |   Ibid.         | None (often used as a baseline model in the literature) |
-| SumyKL                 | Extractive  |   Ibid.         | (Haghighi and Vanderwende, 2009) |
+| SumyLexRank            | Extractive  |   Ibid.         | [(Erkan and Radev, 2004)](http://tangra.si.umich.edu/~radev/lexrank/lexrank.pdf) |
+| SumyTextRank           | Extractive  |   Ibid.         | [(Mihalcea and Tarau, 2004)](https://web.eecs.umich.edu/~mihalcea/papers/mihalcea.emnlp04.pdf) |
+| SumySumBasic           | Extractive  |   Ibid.         | [(Vanderwende et. al, 2007)](http://www.cis.upenn.edu/~nenkova/papers/ipm.pdf) |
+| SumyKL                 | Extractive  |   Ibid.         | [(Haghighi and Vanderwende, 2009)](http://www.aclweb.org/anthology/N09-1041) |
 | SumyReduction          | Extractive  |   Ibid.         | None. |
-| BART-Large CNN         | Abstractive | [facebook/bart-large-cnn](https://huggingface.co/facebook/bart-large-cnn)                    | (Lewis et al., 2019) |
-| Pegasus-XSUM           | Abstractive | [google/pegasus-xsum](https://huggingface.co/google/pegasus-xsum)                            | (Zhang et al., 2020) |
-| mT5 Multilingual XLSUM | Abstractive | [csebuetnlp/mT5_multilingual_XLSum](https://huggingface.co/csebuetnlp/mT5_multilingual_XLSum)| (Raffel et al., 2019) |
+| BART-Large CNN         | Abstractive | [facebook/bart-large-cnn](https://huggingface.co/facebook/bart-large-cnn)                    | [(Lewis et al., 2019)](https://arxiv.org/pdf/1910.13461) |
+| Pegasus-XSUM           | Abstractive | [google/pegasus-xsum](https://huggingface.co/google/pegasus-xsum)                            | [(Zhang et al., 2020)](http://proceedings.mlr.press/v119/zhang20ae/zhang20ae.pdf) |
+| mT5 Multilingual XLSUM | Abstractive | [csebuetnlp/mT5_multilingual_XLSum](https://huggingface.co/csebuetnlp/mT5_multilingual_XLSum)| [(Raffel et al., 2019)](https://www.jmlr.org/papers/volume21/20-074/20-074.pdf?ref=https://githubhelp.com) |
 
 
 ## Model variations