That Purpose". Phil. Trans. R. Soc. (London). Philosophical Transactions of the Royal Society of London, Vol. 74. 74: 35–57. {{cite journal}}: Invalid |ref=harv (help)↑ "Dark Stars (1783)". Thinkquest. 1999. සම්ප්‍රවේශය 2008-05-28.↑ Laplace; see Israel, Werner (1987), "Dark stars: the evolution of an idea", in Hawking, Stephen W. & Israel, Werner, 300 Years of Gravitation, Cambridge University Press, Sec. 7.4↑ උපුටාදැක්වීම් දෝෂය: අනීතික <ref> ටැගය;Schwarzschild1916 නමැති ආශ්‍රේයන් සඳහා කිසිදු පෙළක් සපයා නොතිබුණි↑ Droste, J. (1915). "On the field of a single centre in Einstein's theory of gravitation". Koninklijke Nederlandsche Akademie van Wetenschappen Proceedings. 17 (3): 998–1011. {{cite journal}}: Invalid |ref=harv (help)↑ 't Hooft, G. (2009). Introduction to the Theory of Black Holes (PDF). pp. 47–48.↑ Detweiler, S. (1981). "Resource letter BH-1: Black holes". American Journal of Physics. 49 (5, pp): 394–400. doi:10.1119/1.12686. {{cite journal}}: Invalid |ref=harv (he