per Sarkar, Uttam Kumar, Khan, Gazala Eran, Rebello, Sanjay Christopher, Dubey, Vineet Kumar, Agnihotri, Praveen, Pathak, Ajay Kumar, Pal, Amar, Singh, Sri Prakash

Institution: Universidad Estatal a Distancia

Repositorio: Portal de Revistas UNED

per Das Sarkar, Soma, Sarkar, Uttam Kumar, Naskar, Malay, Roy, Koushik, Bose, Arun Kumar, Nag, Subir Kumar, Karnatak, Gunjan, Das, Basanta Kumar

Institution: Universidad de Costa Rica

Repositorio: Portal de Revistas UCR