Free vibration of square plate

  1. Vibration of Continuous Systems by Singiresu S. Rao, Published by John Wiley & Sons, Inc., Hoboken, New Jersey.

  2. Vibrations and Waves in Continuous Mechanical Systems by P. Hagedorn and A. DasGupta, Published by John Wiley & Sons Ltd, The Atrium, Southern Gate, Chichester, West Sussex PO19 8SQ, England.