Priyanka Bhalerao, Seema Bagora. A Comparative Study of Graceful Labeling and Harmonious Labeling for Business Model which can be obtained by Quaternary Tree. IJCA [Internet]. 2020Jun.7 [cited 2024Apr.20];13(4):1046 -1051. Available from: http://sersc.org/journals/index.php/IJCA/article/view/21329