Kreykenbohm, I., Fürst, F., Barrágan, L., Wilms, J., Rothschild, R.E., Suchy, S. and Pottschmidt, K. 2011. 4U 1909+07: a Hidden Pearl. Acta Polytechnica. 51, 1 (Jan. 2011). DOI:https://doi.org/10.14311/1326.