共 27 条
[3]
Bessel-Hagen E., 1921, MATH ANN, V84, P258
[4]
Bluman G. W., 1989, Symmetries and Differential Equations
[6]
HIETARINTA J, 1986, DIRECT METHODS SEARC
[9]
Ibragimov NH., 1983, Transformation groups applied to mathematical physics