1. Camacho, J. P. M., Cabrero, J. & Viseras, E., 1981. C-heterochromatin variation in the genus Eumigus (Orthoptera: Pamphagoidea). Genetica 56: 185?188.
2. Camacho, J. P. M., Viseras, E., Navas, J. & Cabrero, J., 1984. C-heterochromatin content of supernumerary chromosome segments of grasshoppers: detection of an euchromatic extra segment. Heredity 53: 167?175.
3. Garcia de la Vega, C., Lopez-Fernandez, C., Gosalvez, J. & Rufas, J. S., 1982. Cytogenetic studies on Chorthippus jucundus (Fisch) (Orthoptera). II. Heterochromatin variation and NOR localization. Cytobios 34: 7?14.
4. Gosalvez, J., Garcia de la Vega, C., Lopez-Fernandez, C. & Rufas, J. S., 1981. Cytogenetic studies on Chorthippus jucundus (Fisch) (Orthoptera: Acrididae). I. Heterochromatic segments in Spanish wild populations. Broteria Genetics II (LXXVII): 41?50.
5. Hewitt, G. M., 1979. Animal Cytogenetics. Orthoptera. Vol. 3 Insecta 1. Borntraeger, Berlin-Stuttgart.