Multifrequency filter search for high redshift sources and lensing systems in Herschel-ATLAS A. Manjón-García, D. Herranz, J. M. Diego, L. Bonavera and J. González-Nuevo A&A, 622 (2019) A106 Published online: 05 February 2019 DOI: 10.1051/0004-6361/201834549