@article{10_4153_CJM_1981_002_2,
     author = {Jackson, D. M. and Goulden, I. P.},
     title = {The {Generalisation} of {Tutte's} {Result} for {Chromatic} {Trees,} by {Lagrangian} {Methods}},
     journal = {Canadian journal of mathematics},
     pages = {12--19},
     year = {1981},
     volume = {33},
     number = {1},
     doi = {10.4153/CJM-1981-002-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1981-002-2/}
}