T. Sugiyama

Visual and colorimetric lithium ion sensing based on digital color analysis.

H. Hisamoto, K Suzuki, K. Suzuki, 2000, Analytical chemistry.

Lonophore-based lithium ion film optode realizing multiple color variations utilizing digital color analysis.

Daniel Citterio, Keiko Yasuda, D. Citterio, 2002, Analytical chemistry.