Yutaka Asao

• Danjokan chingin kakusa mondai-dokuhon
• Keizai shakai no kokusaika ga rōdō ni oyobosu eikyō ni kansuru ronten seiri
• Pāto taimā no soshikika ni kansuru rōdō kumiai no torikumi
• Tayōna hatarakikata to sono seisaku kadai ni tsuite