In this paper, we will demonstrate syntactic analysis and visualization of scientific data, namely references from scientific papers. Our main goal is to build a parser which could extract references from scientific papers, convert them to XML format, send to custom visualization algorithm and present in a web interface as a ReferenceTree for a single author. For this process, we use several different technologies such as NLP software NooJ, programming languages PHP and JavaScript in combination with HTML5. Our main problem was dissimilarity in reference styles between articles. Thus, our parser was designed to recognize different reference source (book, paper, web page) in APA, MLA and Chicago reference styles. As for the visualization idea, we have chosen the concept of presenting an author as a tree, the publication years as the main branches, the articles/books as twigs and references used in each article/book as the leaves. The books are grouped on the left side of the tree while the articles are grouped on the right side. With final output, every processed author should have a unique tree (preferences of references) and could be compared with the rest of the scientific forest.

In this paper, we propose, explain and implement bibliometric data analysis and visualization model in a web environment. We use NLP syntactic grammars for pattern recognition of references used in scholarly publications. The extracted information is used for visualizing author egocentric data via tree like structure. The ultimate goal of this work is to use the egocentric trees for comparisons of two authors and to build networks or forests of different trees depending on the forest's attributes. We have stumbled upon many different problems ranging from exceptions in citation style structures to optimization of visualization model in order to achieve an optimal user experience. We will give a summary of our grammars' restrictions and will provide some ideas for possible future work that could improve the overall user experience. The proposed trees can function by themselves, or they can be implemented in digital repositories of libraries and different types of citation databases.

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