@article{10_4153_CJM_1978_067_2,
     author = {Cross, George},
     title = {Additivity of the {P} {n-Integral}},
     journal = {Canadian journal of mathematics},
     pages = {783--796},
     year = {1978},
     volume = {30},
     number = {4},
     doi = {10.4153/CJM-1978-067-2},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1978-067-2/}
}