1. Aira, M., Monroy, F., Domínguez, J., & Mato, S. (2002). How earthworm density affects microbial biomass and activity in pig manure. European Journal of Soil Biology, 38, 7–10.
2. Aira, M., Monroy, F., & Domínguez, J. (2003). Effects of two species of earthworms (Allolobophora sp.) on soil systems: a micro faunal and biochemical analysis. Pedobiologia, 47, 877–881.
3. Aira, M., Monroy, F., & Domínguez, J. (2006). Changes in microbial biomass and microbial activity of pig slurry after the transit through the gut of the earthworm Eudrilus eugeniae. Soil Biology and Biochemistry, 42, 371–376.
4. Bano, K., Kale, R. D., & Vijayalakshmi, D. (1987). Production and reproduction trend in a tropical earthworm Eudrilus eugeniae. In S. Palanichamy (Ed.), Proceedings of 5th Indian symposium of invertebrate reproduction (pp. 210–218). Palani: Palani Paramount Publications.
5. Bhattacharya, K. K., Mukhopadhyay, N., Mukharjee, D., & Das, S. K. (2000). Comparative efficiency of improved compost techniques. In B. B. Jana, R. D. Banerjee, B. Guterstam, & J. Heeb (Eds.), Proceedings of international conference. Waste recycling and resource management in developing world (pp. 219–224). Kolkata: Sapana Printing Works.