H. J. P.  Lambeck, ?Eumerus nigrostriatus sp. n. and its karyotype (Diptera: Syrphidae)?, Genen Phaenen, vol. 16, pp. 27-34, 1973.

H. J. P.  Lambeck and van Brink, J. M., ?Contribution to the knowledge of the taxonomy, faunal composition and cytology of the syrphid flies (Diptera: Syrphidae) of Kashmir (India). I. Taxonomic account and faunal composition?, Genen Phaenen, vol. 16, pp. 87-100, 1973.

H. J. P.  Lambeck and van Brink, J. M., ?Contribution to the knowledge of the taxonomy, faunal composition and cytology of the syrphid flies (Diptera: Syrphidae) of Kashmir (India). II. Karyotypes of eleven species?, Genen Phaenen, vol. 18, pp. 1-15, 1975.

H. J. P.  Lambeck and van Brink, J. M., ?Cytology of hover flies (Diptera: Syrphidae) from Nepal. I. Karyotypes of ten species?, Genen Phaenen, vol. 18, pp. 17-27, 1975.