TY  - JOUR
T1  - Linear Transformations and Functions of Positive Type
JF  - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934)
VL  - 99
IS  - 696
SP  - 19
EP  - 38
PY  - 1921/04/06/
UR  - http://dx.doi.org/10.1098/rspa.1921.0020
M3  - doi:10.1098/rspa.1921.0020
AU  - Mercer, J.
ER  -