TY - JOUR AN - 020042936 PY - 1990/01/01 TI - Solid-state nuclear magnetic resonance studies of phosphorus and boron in coals and combustion residues JO - Fuel VL - 69 IS - 4 SP - 421 EP - 428 UR - https://eurekamag.com/research/020/042/020042936.php ER -