In  a construction on topological groups was given. In this paper we generalize this costruction to more general topological groupoids and have a similar structure on the topological groupodis.
MUCUK, O. (1996) "STAR TOPOLOGICAL GROUPOIDS," Turkish Journal of Mathematics: Vol. 20: No. 2, Article 12. Available at: https://journals.tubitak.gov.tr/math/vol20/iss2/12