Coherent microwave emission without population inversion: a new atomic frequency standard. - Aldo Godone; Filippo Levi; Jacques Vanier (IEEE Trans. Instrum. Meas., 1999)

Systematic shift uncertainty evaluation of IEN CSF1 primary frequency standard. - Filippo Levi; Luca Lorini; Davide Calonico; Aldo Godone (IEEE Trans. Instrum. Meas., 2003)

Frequency-Stability Performances of the Pulsed Optically Pumped Rubidium Clock: Recent Results and Future Perspectives. - Aldo Godone; Filippo Levi; Salvatore Micalizio; Elio K. Bertacco; Claudio E. Calosso (IEEE Trans. Instrum. Meas., 2007)