Ball, J. M. (1983). Systems of no linear partial differential equations [proceedings]. D Reidel.
Dyfyniad Arddull ChicagoBall, J M. Systems of No Linear Partial Differential Equations [proceedings]. Dordrecht: D Reidel, 1983.
Dyfyniad MLABall, J M. Systems of No Linear Partial Differential Equations [proceedings]. D Reidel, 1983.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.