@article{PDA_1979_9_a8,
     author = {J. L. Simovljevitch},
     title = {Estimate of {Perturbation} {Effects} of {Asteroid} {Orbits} {During} {Proximity}},
     journal = {Publications of the Department of Astronomy},
     pages = {75 },
     publisher = {mathdoc},
     volume = {9},
     year = {1979},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PDA_1979_9_a8/}
}