Developing E-learning course "Circular Economy" in the Study process and Adult EducationDzintra Atstāja, Māris Purviņš, Jānis Butkevičs, Inga Uvarova and Natālija Cudečka-PuriņaE3S Web Conf., 371 (2023) 05025DOI: https://doi.org/10.1051/e3sconf/202337105025