Updating citation and links

Citation and links to associated paper updated with publication of data set paper in Public Health & Surveillance.

README.md

@@ -2,7 +2,7 @@
 
 The repository contains an ongoing collection of tweets IDs associated with the novel coronavirus COVID-19 (SARS-CoV-2), which commenced on January 28, 2020. We used the Twitter’s search API to gather historical Tweets from the preceding 7 days, leading to the first Tweets in our dataset dating back to January 21, 2020. We leveraged Twitter’s streaming API to follow specified accounts and also collect in real-time tweets that mention specific keywords. To comply with Twitter’s [Terms of Service](https://developer.twitter.com/en/developer-terms/agreement-and-policy), we are only publicly releasing the Tweet IDs of the collected Tweets. The data is released for non-commercial research use. 
 
-The associated paper to this repository can be found here: [#COVID-19: The First Public Coronavirus Twitter Dataset](https://arxiv.org/abs/2003.07372)
+The associated paper to this repository can be found here: [Tracking Social Media Discourse About the COVID-19 Pandemic: Development of a Public Coronavirus Twitter Data Set](https://publichealth.jmir.org/2020/2/e19273/)
 
 ## Data Organization
 The Tweet-IDs are organized as follows:
@@ -46,7 +46,11 @@ python3 hydrate.py
 # Data Usage Agreement
 This dataset is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International Public License ([CC BY-NC-SA 4.0](https://creativecommons.org/licenses/by-nc-sa/4.0/)). By using this dataset, you agree to abide by the stipulations in the license, remain in compliance with Twitter’s [Terms of Service](https://developer.twitter.com/en/developer-terms/agreement-and-policy), and cite the following manuscript: 
 
-Emily Chen, Kristina Lerman, and Emilio Ferrara. 2020. #COVID-19: The First Public Coronavirus Twitter Dataset.  arXiv:cs.SI/2003.07372, 2020
+Chen E, Lerman K, Ferrara E
+Tracking Social Media Discourse About the COVID-19 Pandemic: Development of a Public Coronavirus Twitter Data Set
+JMIR Public Health Surveill 2020;6(2):e19273 
+DOI: 10.2196/19273 
+PMID: 32427106
 
 # Statistics Summary (v1.10)
 Number of Tweets : **137,339,309**