H. G. Ellis. Ether flow through a drainhole: A particle model in general relativity. Journal of Mathematical Physics. 1973, 14 (1): 104–118. Bibcode:1973JMP....14..104E. doi:10.1063/1.1666161.
H. G. Ellis. Ether flow through a drainhole: A particle model in general relativity. Journal of Mathematical Physics. 1973, 14 (1): 104–118. Bibcode:1973JMP....14..104E. doi:10.1063/1.1666161.