Update README.md

README.md

@@ -6,10 +6,20 @@ B=1 and B=2. Each of our two lexicons,  VERY-NEG  and VERY-POS:
 1- VERY-NEG which consists of a list of the most negative words (MN) and words that are considered to be not most negative (NMN).
 
 2- VERY-POS is composed of a list of the most positive words (MP) and of those words that are not classified as most positive (NMP)
+
 # FORMAT
 ------------------------------------------------
 Both lexicons consist of four columns:
-W: the words.
-Tag: the part of speech tag adjective (A) or adverb (R).
-Class: MN, NMN, MP, NMP.
-D(x): The weight of each word (W).
+* W: the words.
+* Tag: the part of speech tag adjective (A) or adverb (R).
+* Class: MN, NMN, MP, NMP.
+* D(x): The weight of each word (W).
+
+
+# REFERENC
+----------------------------------------------------------
+If you use VERY=NEG OR VERY-POS lexicon in your research, please cite the folowing paper, where All details are contained.
+
+ * Almatarneh S, Gamallo P (2018) A lexicon based method to search for extreme opinions. PLoS ONE 13(5): e0197816. https://doi.org/10.1371/journal.pone.0197816
+ 
+