K. S. Kulkarni, P. Lakhani, S. A. Dalvi, and C. Gupta, “Correlation between maternal serum biochemical markers with karyotyping for prenatal screening of foetal chromosomal abnormalities”, Int J Reprod Contracept Obstet Gynecol, vol. 6, no. 11, pp. 4851–4856, Oct. 2017.