Phosphorous and Silica Recovery from Rice Husk Poultry Litter Ash: A Sustainability Analysis Using a Zero-Waste Approach oleh Laura Fiameni, Ario Fahimi, Claudio Marchesi, Giampiero Pasquale Sorrentino, Alessandra Zanoletti, Karen Moreira, Bruno Valentim, Georgeta Predeanu, Laura Eleonora Depero, Elza Bontempi