(en) Stefano Bocchi et Antonino Malgioglio, « Azolla-Anabaena as a Biofertilizer for Rice Paddy Fields in the Po Valley, a Temperate Rice Area in Northern Italy », International Journal of Agronomy, vol. 2010, (DOI10.1155/2010/152158, lire en ligne).
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(en) Stefano Bocchi et Antonino Malgioglio, « Azolla-Anabaena as a Biofertilizer for Rice Paddy Fields in the Po Valley, a Temperate Rice Area in Northern Italy », International Journal of Agronomy, vol. 2010, (DOI10.1155/2010/152158, lire en ligne).