0864-215X 0864-215X S0864-215X2021000100017 Peru Perú 00 06 2021 00 06 2021 35 1 1 2020 34 1 1 2 2019 3 4 4 igz036 3 2018 1 3 3 367-74 4 2020 5 2017 14 5 5 545-55 6 1961 7 2018 18 1 1 178