@article{10_4153_CMB_1975_102_1,
     author = {Peterson, Allan C. and Sukup, Dwight V.},
     title = {On the {First} {Conjugate} {Point} {Function} for {Nonlinear} {Differential} {Equations}},
     journal = {Canadian mathematical bulletin},
     pages = {577--585},
     year = {1975},
     volume = {18},
     number = {4},
     doi = {10.4153/CMB-1975-102-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1975-102-1/}
}