%0 Journal Article %T Stepwise photochromism of bisnaphthopyrans exhibiting an excitation intensity-dependent color change %A Inagaki, Yuki %A Mutoh, Katsuya %A Abe, Jiro %J Photochemical & Photobiological Sciences %V 17 %N 7 %P 946-953 %@ 1474-905X %D 2018-07-11 %I The Royal Society of Chemistry %~ DeepDyve