J. Caiza, M. Salas, C. Guevara, and J. Ramírez, “Identification of factors of vulnerability of self-employed workers and in relation to dependency in times of COVID-19 in Ecuador”, Cuestiones Económicas, vol. 31, no. 3, p. Autores: Josselyn Caiza , Marjorie Salas , Carolina Guevara y José Ramírez, Nov. 2021.