@article{10_4153_CJM_1970_080_0,
     author = {Wakae, Masami and Hamara, Oma},
     title = {A {Mapping} {Problem} and {Jp} {-Index.} {I}},
     journal = {Canadian journal of mathematics},
     pages = {705--712},
     year = {1970},
     volume = {22},
     number = {4},
     doi = {10.4153/CJM-1970-080-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1970-080-0/}
}