Havana University, Biology Faculty, Havana, Cuba: Master's degree in Microbiology, Microbial Ecology (27 April 2004)
Environmental monitoring of chemical pollution in the Almendares River, Cuba.Workshop on Treatment and Management of Solid Wasteand Wastewater. Volume 7.ISBN 959-7136-43-0, Yunier Arpajón, Zoila Castaño, Raúl Masán, Denis Desgain, Nathalie Roevros, Daysi Lugo, Josué Prats, Lei Chou, Nidia Rojas and Mayra Heydrich (2006).
Potential risk due to microbial pollution in the Almendares River. Workshop on Treatment and Management of Solid Waste and Wastewater. Volume 7. ISBN 959-7136-43-0, Prats, J., Larrea, J., García- Armisen, T., Lugo, D., Rodríguez, A., Servazis, P., Rojas, N. and Heydrich, M. (2006).
Caracterizacion fisiologica de la comunidad microbiana neofita de la cana de azucar [Physiological Characteristics of the Neophytic Microbial Community in Sugarcane], Revista colombiana de biotecnología, VII, No.1, Rodríguez, A. J., Trujillo, I. D., Felipe, Y., Rojas, M. M., Manzano, J., Heydrich, M. (2005).