By Milson R.   in International Journal of Theoretical Physics

ISSN:0020-7748|37|6|1735-1752

Springer Publishing Company ‎(1998)‎

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By Kamran N.   Milson R.   Olver P.J.   in Advances in Mathematics

ISSN:0001-8708|156|2|286-319

Academic Press‎(2000)‎

Access to resources Favorite 8.868153