Milillo, Lucrezia, Marei Hacke, Sara Norrehed, Ilaria Degano, Francesca Gherardi, and Ellinor Gunnarsson. “Heritage science contribution to the understanding of meaningful khipu colours.” Heritage 6, no. 3 (2023): 2355-2378.

Full text at this link

Milillo, Lucrezia. “New Perspectives on Khipu Semantics Based on a Khipu in the Pigorini Museum in Rome, Italy.” In Khipus Y Khipus Kamayuqs, Códigos Contables, Narrativos Y Los Amautas De La Memoria Inca, edited by G. E. Apus: EY, Ernst & Young Perú, 2020

Full text here