@article{PDA_1979_9_1_a7,
     author = {J. L. Simovljevitch},
     title = {Further {Note} on the {Calculus} of {Perturbations} of {Asteroid} {Orbits} {During} {Proximity}},
     journal = {Publications of the Department of Astronomy},
     pages = {71 - 74},
     publisher = {mathdoc},
     volume = {9},
     number = {1},
     year = {1979},
     url = {http://geodesic.mathdoc.fr/item/PDA_1979_9_1_a7/}
}