@article{10_21136_CMJ_1977_101496,
     author = {Chao, Chong-Yun},
     title = {On a conjecture of the semigroup of fully indecomposable relations},
     journal = {Czechoslovak Mathematical Journal},
     pages = {591--597},
     publisher = {mathdoc},
     volume = {27},
     number = {4},
     year = {1977},
     doi = {10.21136/CMJ.1977.101496},
     mrnumber = {0450067},
     zbl = {0384.20051},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1977.101496/}
}