https://github.com/motohirokmg/motohirokmg.github.io/blob/c4c1e556cea6b4fc8bc86502123ba3e6f5e9e7f9/cv/kumagai_cv.pdf.
https://github.com/motohirokmg/motohirokmg.github.io/blob/e4c71c73a8656185b05c12e010267f7f1d36aada/jmp/kumagai_jmp.pdf.
https://github.com/motohirokmg/motohirokmg.github.io/blob/e4c71c73a8656185b05c12e010267f7f1d36aada/jmp/kumagai_extinction_neolithic.pdf.
https://github.com/motohirokmg/motohirokmg.github.io/blob/900e2b037813c0ff650277e8634e42325187b1f3/horse_state/kumagai_horse_state.pdf.
https://github.com/motohirokmg/motohirokmg.github.io/blob/9a559924c551ce1e0481f83600d137fc19b860ae/mammal_risk/kumagai_mammal_risk.pdf.