Text ( visual ) : unmediated Magnetism and very low temperatures / by H.B.G. Casimir. -- Cambridge : University Press , 1940. -- 93 p. ; 22 cm. -- (Cambridge physical tracts / general editors M. L. E. Oliphant, J. A. Ratcliffe). -- Bibliographical references: p. [91]-93. -- (BA29152988) ; https://ci.nii.ac.jp/ncid/BA29152988 Author Heading(s): Casimir, H. B. G. (Hendrik Brugt Gerhard)