Kumbár, Vojtěch, Sylvie Ondrušíková, and Šárka Nedomová. “Rheological Properties of Tomato Ketchup”. Potravinarstvo Slovak Journal of Food Sciences 13, no. 1 (September 28, 2019): 730-734. Accessed December 20, 2019. https://potravinarstvo.com/journal1/index.php/potravinarstvo/article/view/1161.