The following publications are possibly variants of this publication: 
- PAU instrument aboard INTA MicroSat-1: A GNSS-R demonstration mission for sea state correction in L-band radiometryAdriano Camps, Juan Fernando Marchan-Hernandez, Enric Valencia, Isaac Ramos-Perez, Xavier Bosch-Lluis, Nereida Rodriguez-Alvarez, Hyuk Park, Antonio Alcayde, A. Mollfulleda, J. Galindo, Pedro Martinez, Sergio Chavero, Manuel Angulo, Antonio Rius. igarss 2011: 4126-4129 [doi] 
- Synthetic Aperture PAU: a new instrument to test potential improvements for future SMOSopsIsaac Ramos-Perez, Adriano Camps, Xavier Bosch-Lluis, Juan Fernando Marchan-Hernandez, Nereida Rodriguez-Alvarez, Enric Valencia, Fabio Frascella, Paolo Campigotto, Marco Donadio. igarss 2007: 247-250 [doi]