first order difference equation
neutral difference equation
arithmetic progression of higher order
高阶等差数列
亚洲栽培稻生态型
燃料空气炸药(FAE)
derivatives of higher order
differential equation of higher order
differentials of higher order
higher order aberration
Higher order aberrations
higher order approximation parabolic mild slope equation
higher order Boussinesq equations
higher order Delaunay triangulation
higher order differential equation
higher order frequency coupling
higher order Hamilton equations