@article{DAN_1967_173_6_a11,
     author = {G. E. Kuzmak and N. I. Lavrenko},
     title = {Optimal transfer flights between close nearly circular noncoplanar orbits},
     journal = {Doklady Akademii Nauk},
     pages = {1273--1276},
     year = {1967},
     volume = {173},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1967_173_6_a11/}
}