APA (7th ed.) Citation

Groen, P. P. N. d. (1976). Singularly perturbed differential operators of second order. Math. Centrum.

Chicago Style (17th ed.) Citation

Groen, P. P. N. de. Singularly Perturbed Differential Operators of Second Order. Amsterdam: Math. Centrum, 1976.

MLA (9th ed.) Citation

Groen, P. P. N. de. Singularly Perturbed Differential Operators of Second Order. Math. Centrum, 1976.

Warning: These citations may not always be 100% accurate.