New bilayer-coated microbead system for controlled release of 5-aminosalicylic acid / Karewicz Anna , Łęgowik Joanna, Nowakowska Maria // Polymer Bulletin. - 2011 vol. 66 no. 3, p. 433-443. - ISSN 0170-0839. - eISSN 1436-2449. - https://link.springer.com/content/pdf/10.1007%2Fs00289-010-0370-2.pdf