no. 2
On stellar collapse : continual or oscillatory ? A short comment
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 33 (1980) no. 2, pp. 205-208. 
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     author = {Leung, P. T.},
     title = {On stellar collapse : continual or oscillatory ? {A} short comment},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {205--208},
     publisher = {Gauthier-Villars},
     volume = {33},
     number = {2},
     year = {1980},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1980__33_2_205_0/}
}
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Leung, P. T. On stellar collapse : continual or oscillatory ? A short comment. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 33 (1980) no. 2, pp. 205-208. http://archive.numdam.org/item/AIHPA_1980__33_2_205_0/

[1] M. Sachs, Ann. Inst. Henri Poincaré, Section A: Physique théorique. Vol. XXVIII, n° 4, 1978, p. 399-405. | Numdam

[2] R.K. Sachs and H. Wu, General Relativity for Mathematicians, by Springer-Verlag, New York, Inc., 1977. | MR | Zbl

[3] R. Adler, M. Bazin and M. Schiffer, Introduction to General Relativity, by McGraw-Hill, Inc., Sec. 9.6, 1965. | MR | Zbl