I don't think this is a good practice to boost citation index. I came over this paper which seems to say that too much self-citation is good and increases citation counts in the long run.
http://www.academia.edu/934257/How_to_increase_your_papers_citations_and_h_index_in_5_simple_steps
http://www.nature.com/news/2010/100813/full/news.2010.406.html