1. Discrete and continuous “boundary problems”;Atkinson,1964
2. Lirait-n criteria of integral type;Atkinson;Proc. Roy. Soc. Edin. (A),1975
3. Solutions of a differential equation which are not of integrable square;Atkinson;Math. Z.,1972
4. Theory of ordinary differential equations;Coddington,1955
5. “On a limit-point method of Hartman;Eastham;Bull London Math. Soc.,1972