SULFUR STAYS IN THE ASH WHEN LIGNITE BURNS = LE SOUFRE RESTE DANS LES CENDRES LORSQUE LE LIGNITE BRULELEVENE HD; HAND JW.1975; COAL MING PROCESSG; U.S.A.; DA. 1975; VOL. 12; NO 2; PP. 46-48; BIBL. 3 REF.Article

SYNTHETIC FUELS-SOURCES, COSTS, AND AMOUNT = COMBUSTIBLES SYNTHETIQUES: SOURCES, COUTS ET QUANTITECAMERON RJ; LEVENE HD; DAILEY JL et al.1973; AMER. PETROLEUM INST., PROC., DIV. REFING; U.S.A.; DA. 1973; VOL. 53; PP. 759-767; BIBL. 9 REF.; (38TH MIDYEAR MEET. AM. PET. INST. DIV. REFINING. PROC.; PHILADELPHIA, PA.; 1973)Conference Paper