@article{10_4153_CJM_1980_096_5,
     author = {Lehman, B.},
     title = {K-Coherence is {Cyclicly} {Extensible} and {Reducible}},
     journal = {Canadian journal of mathematics},
     pages = {1270--1276},
     year = {1980},
     volume = {32},
     number = {5},
     doi = {10.4153/CJM-1980-096-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1980-096-5/}
}