1. E.B. Howard and L.G. Timothy, Metals Handbook Desk Edition, vol. 1. (American Society for Metals, Russell Township, 1985).
2. L. Shen-Chih, and S. Jia-Ming, Ultrasonic nondestructive evaluation of matrix structures and nodularity in cast irons. Metal. Trans. A 20A, 2399–2407 (1989).
3. P.P. Nanekar and B.K. Shah, Characterization of materials properties by ultrasonics. BARC Newslett. 249, 25–38 (2004)
4. M. Nadeem Bhat, D.M. Afzal Khan and K.K. Singh, Effect of preconditioning and inoculation on graphite nodule count and their size distribution in spheroidal graphite (SG) cast iron: a study to minimise rejection of castings due to shrinkage porosity. Int. J. Metalcast. 13(1), 89–97 (2018). https://doi.org/10.1007/s40962-018-0230-7
5. S.A. Kamble, S.B. Rayjadhav and V.D. Shinde, Review paper on characterization of casting material by ultrasonic techniques. Int. J. Innov. Res. Sci. Technol. (IJIRST) 05(12), 21–24 (2019).