On equivalent conditions for the solvability of equation (p(t)x ')'+f(t,x)=h(t) satisfying linear boundary conditions with f restricted by linear growth conditions
Yj. Dong, On equivalent conditions for the solvability of equation (p(t)x ')'+f(t,x)=h(t) satisfying linear boundary conditions with f restricted by linear growth conditions, J MATH ANAL, 245(1), 2000, pp. 204-220