Update README.md

README.md

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 # Spanish Passage Retrieval
-This repository provides data from https://mklab.iti.gr/results/spanish-passage-retrieval-dataset/ as a HF dataset. 
-The data is not present in the repository but is downloaded on the fly. 
+This repository provides data from https://mklab.iti.gr/results/spanish-passage-retrieval-dataset/ as a HF dataset.
 
 There is an S2S (retrieve passages/sentences that are marked as relevant) and an 
 S2P (retrieve documents that contain relevant passages/sentences) version of the retrieval task. The respective corpuses are called `'corpus.sentences'` and `'corpus.documents'`.
-The qrel data is contained in `'qrels.s2s'` and `'qrels.s2p'`, which hold space-separated lists of relevant documents.
+The qrel data is contained in `'qrels.s2s'` and `'qrels.s2p'`, which hold space-separated lists of relevant documents.
+
+# Citation
+
+```
+@inbook{inbook,
+author = {Kamateri, Eleni and Tsikrika, Theodora and Symeonidis, Spyridon and Vrochidis, Stefanos and Minker, Wolfgang and Kompatsiaris, Ioannis},
+year = {2019},
+month = {04},
+pages = {148-154},
+title = {A Test Collection for Passage Retrieval Evaluation of Spanish Health-Related Resources},
+isbn = {978-3-030-15718-0},
+doi = {10.1007/978-3-030-15719-7_19}
+}
+```