Spin-1 diquark contributing to the formation of tetraquarks in light mesons Hungchong Kim, Myung-Ki Cheoun and K. S. Kim Eur. Phys. J. C, 77 3 (2017) 173 Published online: 20 March 2017 DOI: 10.1140/epjc/s10052-017-4736-6