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K.-H. Mack, M. Vigotti, L. Gregorini, et al. ESO Astrophysics Symposia European Southern Observatory, Exploring the Cosmic Frontier 137 (2007) https://doi.org/10.1007/978-3-540-39756-4_40
Flat-spectrum symmetric objects with ∼1 kpc sizes – I. The candidates
Pedro Augusto, J. Ignacio Gonzalez-Serrano, Ismael Perez-Fournon and Peter N. Wilkinson Monthly Notices of the Royal Astronomical Society 368(3) 1411 (2006) https://doi.org/10.1111/j.1365-2966.2006.10227.x