- 
								[1]
								P. O. Mazur et al., Proc. Natl. Acad. Sci 101, 9545 (2004) 
- 
								[2]
								E. Mottola and P. O. Mazur, Gravitational Condensate Stars: An Alternative to Black Holes, in American Physical Society, April Meeting (New Mexico, 2002) 
- 
								[3]
								N. Sakai et al., Phys. Rev. D 90, 104013 (2014) 
- 
								[4]
								T. Kubo, and N. Sakai, Phys. Rev. D 93, 084051 (2016) 
- 
								[5]
								V. Cardoso et al., Phys. Rev. Lett. 116, 171101 (2016) 
- 
								[6]
								V. Cardoso et al., Phys. Rev. Lett. 117, 089902 (2016) 
- 
								[7]
								K. Akiyama et al., Astrophys. J. Lett. 875, 1 (2019) 
- 
								[8]
								M. Visser et al., Class. Quantum Grav. 21, 1135 (2004) 
- 
								[9]
								B.M.N. Carter, Class. Quantum Grav. 22, 4551 (2005) 
- 
								[10]
								N. Bilic et al., J. Cosmol. Astropart. Phys. 02, 013 (2006) 
- 
								[11]
								F. Lobo, Class Quantum Gravity 23, 1525 (2006) 
- 
								[12]
								F. Lobo et al., Class. Quantum Grav. 24, 1069 (2007) 
- 
								[13]
								C. Cattoen, et al., Class. Quantum Grav. 22, 4189 (2005) 
- 
								[14]
								S. Ghosh et al., Phys. Lett. B 767, 380 (2017) 
- 
								[15]
								S. Ghosh et al., Results in Physics 14, 102473 (2019) 
- 
								[16]
								F. Rahaman et al., Phys Lett B 707, 319 (2012) 
- 
								[17]
								A. A. Usmani et al., Phys. Lett. B 701, 388 (2011) 
- 
								[18]
								M. Sharif , S. Naz, Eur. Phys. J. P. 137, 4 (2022) 
- 
								[19]
								A. Das et al., Nucl. Phys. B. 954, 114986 (2020) 
- 
								[20]
								O. Sokoliuk et al., Phys. Lett. B. 829, 137048 (2022) 
- 
								[21]
								M.Z. Bhatti et al., Phys. Dark Univ. 29, 100561 (2020) 
- 
								[22]
								H. A. Buchdahl, Mon. Not. Roy. Astron. Soc. 150, 1 (1970) 
- 
								[23]
								S. Mandal et al., Phys. of dark Univ. 35, 100934 (2022) 
- 
								[24]
								O. Sokoliuk et al., Eur. Phys. J. Plus. 137, 1077 (2022) 
- 
								[25]
								T. Ortin, Gravity and Strings (Camb. Univ. Press, 2015) 
- 
								[26]
								Y. Xu et al., Eur. Phys. J. C 79, 708 (2019) 
- 
								[27]
								B. Kuchowicz, Acta Phys. Pol., 33, 541 (1968) 
- 
								[28]
								S. Perlmutter et al., Astrophys J. 517, 565 (1999) 
- 
								[29]
								A. G. Riess et al., Astron J 116, 1009 (1998) 
- 
								[30]
								S. Ray et al., Gravit Cosmol 13, 142 (2007) 
- 
								[31]
								Y. B. Zeldovich, Mon. Not. R. Astron. Soc. 160, 1 (1972) 
- 
								[32]
								G. Darmois, Memorial des sciences maths XXV (Gauthier-Villars, Paris, 1927) 
- 
								[33]
								W. Israel, Nuovo Cimento B 44, 1 (1966) 
- 
								[34]
								K. Lanczos, Ann Phys (Berlin) 379, 518 (1924)