Kenro Furutani, Nobukazu Otsuki. Maslov index in the infinite dimension and a splitting formula for a spectral flow. Japanese Journal of Mathematics. 2002. 28. 2. 215-243
Kenro Furutani, Nobukazu Otsuki. Maslow index in the infinite dimension and a splitting formula for a spectral flow. Japanese Journal of Mathematics. 2002. 28. 2. 215-243
Kenro Furutani, Nobukazu Otsuki. Criss-Cross Reduction of the Maslow index and a proof of the Yosida-Nicolaescu Theorem. Tokyo J. of Math. 2001. 24. 1. 16頁