Somporn Choonluchanon. 1995. Preservation of azolla-anabaena symbiotic system as nitrogen fixing biofertilizer in Thai paddy fields. Faculty of Agriculture, Kyushu University;
Somporn Choonluchanon. (1995) Preservation of azolla-anabaena symbiotic system as nitrogen fixing biofertilizer in Thai paddy fields . Kyushu University/Fukuoka.
Somporn Choonluchanon. Preservation of azolla-anabaena symbiotic system as nitrogen fixing biofertilizer in Thai paddy fields. . Fukuoka:Kyushu University, 1995.
Somporn Choonluchanon. (1995) Preservation of azolla-anabaena symbiotic system as nitrogen fixing biofertilizer in Thai paddy fields . Kyushu University/Fukuoka.