@article{SF_1980__20_134406,
     author = {G. Thierrin and A. Paradis},
     title = {Strong endomorphisms of {TT-connected} automata},
     journal = {Semigroup forum},
     pages = {91--93},
     publisher = {mathdoc},
     volume = {20},
     year = {1980},
     zbl = {0442.68055},
     url = {http://geodesic.mathdoc.fr/item/SF_1980__20_134406/}
}