@misc{10_4153_CJM_1990_060_7,
     title = {Addendum},
     journal = {Canadian journal of mathematics},
     pages = {1131--1131},
     year = {1990},
     volume = {42},
     number = {6},
     doi = {10.4153/CJM-1990-060-7},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1990-060-7/}
}