A. N. Bhavale, S. S. Mundekar, P. V. Kule, and K. K. Shete. “Hasse Diagrams of Basic Blocks Containing Four Comparable Reducible Elements and Having Nullity Five”. International Journal of Mathematics And its Applications 13, no. 2 (June 16, 2025): 27–34. Accessed July 9, 2025. https://ijmaa.in/index.php/ijmaa/article/view/1552.