Ultrasonic Velocities and Densities of L-Phenylalanine, L-Leucine, L-Glutamic Acid, and L-Proline + 2 mol·L-1 Aqueous NaCl and 2 mol·L-1 Aqueous NaNO3 Solutions from (298.15 to 328.15) K Riyazuddeen; Afrin, S.; Journal of Chemical & Engineering Data 2010, 55, 2643-2648