Gálvez, M. C., Montes Gutiérrez, D., Fernández Figueroa, M. J., Castro Rubio, E. D., & Cornide Castro-Piñeiro, M. (2007). Multiwavelength optical observations of chromospherically active binary systems - V. FF UMa (2RE J0933+624): A system with orbital period variation.

Gálvez, M. C., David Montes Gutiérrez, María José Fernández Figueroa, Elisa De Castro Rubio, and Manuel Cornide Castro-Piñeiro. Multiwavelength Optical Observations of Chromospherically Active Binary Systems - V. FF UMa (2RE J0933+624): A System With Orbital Period Variation. 2007.

Gálvez, M. C., et al. Multiwavelength Optical Observations of Chromospherically Active Binary Systems - V. FF UMa (2RE J0933+624): A System With Orbital Period Variation. 2007.