Solubilities of Isonicotinic Acid in Sulfuric Acid + Water and 4-Methylpyridine + Sulfuric Acid + Water from (293.55 to 361.45) K Song, C.Y.; Wang, H.; Ding, H.; Zhao, J.H.; Wang, J.S.; Wang, L.C.; Journal of Chemical & Engineering Data 2010, 55, 2495-2497