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Corbet, R. H. D.; Sokoloski, J. L.; Mukai, K.; Markwardt, C. B.; Tueller, J. . (2008). A Comparison of the Variability of the Symbiotic X‐Ray Binaries GX 1+4, 4U 1954+31, and 4U 1700+24 from <i>Swift</i> BAT and <i>RXTE</i> ASM Observations. The Astrophysical Journal, 675(2), 1424–1435. doi:10.1086/526337 
10.1086/526337