Müller, H.; Peters, A.; Chu, S. (2010). "A precision measurement of the gravitational redshift by the interference of matter waves". Nature. 463 (7283): 926–9. Bibcode:2010Natur.463..926M. doi:10.1038/nature08776. PMID20164925. S2CID4317164. According to Nature he worked on this "during nights, weekends and on planes – after putting in 70–80 hours a week as energy secretary"
Müller, H.; Peters, A.; Chu, S. (2010). "A precision measurement of the gravitational redshift by the interference of matter waves". Nature. 463 (7283): 926–9. Bibcode:2010Natur.463..926M. doi:10.1038/nature08776. PMID20164925. S2CID4317164. According to Nature he worked on this "during nights, weekends and on planes – after putting in 70–80 hours a week as energy secretary"
Müller, H.; Peters, A.; Chu, S. (2010). "A precision measurement of the gravitational redshift by the interference of matter waves". Nature. 463 (7283): 926–9. Bibcode:2010Natur.463..926M. doi:10.1038/nature08776. PMID20164925. S2CID4317164. According to Nature he worked on this "during nights, weekends and on planes – after putting in 70–80 hours a week as energy secretary"
Müller, H.; Peters, A.; Chu, S. (2010). "A precision measurement of the gravitational redshift by the interference of matter waves". Nature. 463 (7283): 926–9. Bibcode:2010Natur.463..926M. doi:10.1038/nature08776. PMID20164925. S2CID4317164. According to Nature he worked on this "during nights, weekends and on planes – after putting in 70–80 hours a week as energy secretary"