C. Hayashi, « Proton-neutron concentration ratio in the expanding Universe at the stages preceding the formation of the elements », Progress of Theoretical Physics (Japan), vol. 5, , p. 224–235 (DOI10.1143/PTP.5.224)
C. Hayashi, « Evolution of Stars of Small Masses in the Pre-Main-Sequence Stages », Progress of Theoretical Physics, vol. 30, no 4, , p. 460–474 (DOI10.1143/PTP.30.460)