@article{1103035963,
author = {Lehman, R. Sherman},
title = {Algebraic properties of the composition of solutions of partial differential equations.},
journal = {Pacific J. Math.},
volume = {13},
number = {4},
year = {1963},
pages = { 157-168},
language = {en},
url = {http://dml.mathdoc.fr/item/1103035963}
}
Lehman, R. Sherman. Algebraic properties of the composition of solutions of partial differential equations.. Pacific J. Math., Tome 13 (1963) no. 4, pp. 157-168. http://gdmltest.u-ga.fr/item/1103035963/