Dzhivoderova-Zarcheva, Mina, et al. “Rheological and Structural Properties of Tomato Ketchup As Affected by the Addition of Native and Modified Starches”. Bulgarian Journal of Agricultural Science, vol. 27, no. 1, Feb. 2021, pp. 220-6, https://agriacad.eu/ojs/index.php/bjas/article/view/2386.