Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Alexander Van-Brunt and Matt Visser,Explicit Baker–Campbell–Hausdorff Expansions,Mathematics,2227-7390,MDPI AG,2018-08-08,6,,135,https://cir.nii.ac.jp/crid/1874242817456697088,https://doi.org/10.3390/math6080135