1. Jordan K.C.andBirden J.H.(1954).Thermal Batteries Using Polonium‐210.MLM‐984.Mound Laboratory Miamisburg OH.https://doi.org/10.2172/4406897
2. Birden J.H.andJordan K.C.(1959).Radioactive battery. US Patent 29 135 10A.
3. Clauser F.H.et al. (1946).Preliminary Design of an Experimental World‐Circling Spaceship.SM‐11827 p.340.Douglas Aircraft Company Santa Monica CA.https://www.rand.org/pubs/special_memoranda/SM11827.html(accessed 29 November 2022).
4. Avalrez L.W.et al. (1947).Use of Nuclear Energy in the Satellite.RA‐15032 p.60.Douglas Aircraft Company Santa Monica CA.https://www.governmentattic.org/RAND/RA‐15032.pdf(accessed 29 November 2022).