@article{10_4153_CMB_1979_035_6,
     author = {Johnson, Dudley Paul},
     title = {Hitting {Time} {Distributions} {When} {\ensuremath{\Sigma}} xk/dk {Has} a {Smooth} {Density}},
     journal = {Canadian mathematical bulletin},
     pages = {293--298},
     year = {1979},
     volume = {22},
     number = {3},
     doi = {10.4153/CMB-1979-035-6},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1979-035-6/}
}