column
2020, 38(1): 1-9.
DOI: 10.11913/PSJ.2095-0837.2020.10001
2020, 38(1): 23-31.
DOI: 10.11913/PSJ.2095-0837.2020.10023
2020, 38(1): 32-38.
DOI: 10.11913/PSJ.2095-0837.2020.10032
2020, 38(1): 47-57.
DOI: 10.11913/PSJ.2095-0837.2020.10047
2020, 38(1): 68-76.
DOI: 10.11913/PSJ.2095-0837.2020.10068
2020, 38(1): 97-104.
DOI: 10.11913/PSJ.2095-0837.2020.10097
2020, 38(1): 143-149.
DOI: 10.11913/PSJ.2095-0837.2020.10143