Face changing companion of the redback millisecond pulsar PSR J1048+2339 Y. X. Yap, K. L. Li, A. K. H. Kong, J. Takata, J. Lee and C. Y. Hui A&A, 621 (2019) L9 Published online: 14 January 2019 DOI: 10.1051/0004-6361/201834545