@article{1195516327,
author = {Kashiwara, Masaki and Miwa, Tetsuji},
title = {The $\tau$ function of the Kadomtsev-Petviashvili equation transformation groups for soliton equations, I},
journal = {Proc. Japan Acad. Ser. A Math. Sci.},
volume = {57},
number = {1},
year = {1981},
pages = { 342-347},
language = {en},
url = {http://dml.mathdoc.fr/item/1195516327}
}
Kashiwara, Masaki; Miwa, Tetsuji. The $\tau$ function of the Kadomtsev-Petviashvili equation transformation groups for soliton equations, I. Proc. Japan Acad. Ser. A Math. Sci., Tome 57 (1981) no. 1, pp. 342-347. http://gdmltest.u-ga.fr/item/1195516327/