Tahir, Hafsa, et al. “Development of Prebiotic Galactooligosaccharide Enriched Buttermilkand Evaluation of Its Storage Stability: Prebiotic Galactooligosaccharide Enriched Buttermilk”. Progress in Nutrition, vol. 21, no. 4, Dec. 2019, pp. 935-42, https://doi.org/10.23751/pn.v21i4.7579.