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Vekua Ilʹja Nestorovič, 1968. New methods for solving elliptic equations. 2. print. Amsterdam: North-Holland Publ. Co. [u.a.]. North-Holland series in applied mathematics and mechanics, 1.

Vekua, I. N. „New methods for solving elliptic equations“. North-Holland series in applied mathematics and mechanics, 2. print., book, North-Holland Publ. Co. [u.a.], 1968.

Vekua Ilʹja Nestorovič: New methods for solving elliptic equations, . North-Holland series in applied mathematics and mechanics, 2. print. Aufl. Amsterdam 1968.

Vekua, I.N. (1968), New methods for solving elliptic equations, North-Holland series in applied mathematics and mechanics, 2. print., Bd. , North-Holland Publ. Co. [u.a.], Amsterdam.