Livelihood security of small holder farmers in eastern Himalayas, India: Pond based integrated farming system a sustainable approach oleh Anup Das, Debashis Datta, Tanmay Samajdar, Ramkrushna Gadhiji Idapuganti, Mokidul Islam, Burhan Uddin Choudhury, Kamal Prasad Mohapatra, Jayanta Layek, Subhash Babu, Gulab Singh Yadav