Bhavale, Dr. A., P. A. Parate, P. H. Tupte, and S. V. Shirsath. “Hasse Diagrams of Basic Blocks Containing Four Comparable Reducible Elements and Having Nullity Four”. International Journal Of Mathematics And Computer Research 13, no. 4 (April 22, 2025): 5099-5106. Accessed October 23, 2026. https://mail.ijmcr.in/index.php/ijmcr/article/view/935.