1209.2658 (Krzysztof Belczynski et al.)

Cyg X-3: a Galactic double black hole or black hole-neutron star
progenitor
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Krzysztof Belczynski, Tomasz Bulik, Ilya Mandel, B. S. Sathyaprakash, Andrzej Zdziarski, Joanna Mikolajewska