1 02105551_a2019v44n1 1 02105551_a2021v46n2 1 02105721v124n6 1 02105810v57n1 2 02105853 - 02105853n159 3 02105853v10n1 1 02105853v16n132 1 02105853v16n132-133 1 02105853v16n135 1 02105853v17n137