1. Armellini, G.: 1953, ?Osservazioni sul problema dei due corpi di masse variabili e sopra alcune sue applicazioni alla cosmogonia?,Atti Accad. Naz. Lincei 14, 727.
2. Blaauw, A.: 1961, ?On the Origin of the O- and B-type Stars with High Velocities (the ?Run-Away? Stars), and Some Related Problems?,Bull. Astron. Inst. Neth. 15, 265.
3. Boersma, J.: 1961, ?Mathematical Theory of the Two-Body Problem with One of the Masses Decreasing with Time?,Bull. Astron. Inst. Neth. 15, 291.
4. Bogoliubov, N. N. and Mitropolsky, Y. A.: 1961,Asymptotic Methods in the Theory of Non-Linear Oscillations, Gordon and Breach Publ., New York.
5. Coddington, E. A. and Levinson, N.: 1955,Theory of Ordinary Differential Equations, McGraw-Hill Book Co., New York.