L. Helldner

APEX: the Atacama Pathfinder EXperiment

G. Siringo, M. Pantaleev, T. K. Sridharan, 2006, SPIE Astronomical Telescopes + Instrumentation.

Development of the cryogenic 2–14 GHz Eleven feed system for VLBI2010

Jian Yang, T. Ekebrand, Jungang Yin, 2012, 2012 6th European Conference on Antennas and Propagation (EUCAP).

A circular Eleven feed with significantly improved aperture efficiency over 1.3–14 GHz

J. Yin, J. Yang, L. Helldner, 2012, 2012 6th European Conference on Antennas and Propagation (EUCAP).