Comments on "Normal modes of a continuous system with quadratic and cubic non-linearities"
LOWER FREQUENCIES OF TRANSVERSE VIBRATIONS OF CIRCULAR MEMBRANES WITH DISTURBED BOUNDARIES
COMMENTS ON "MEASUREMENT OF VIBRATIONAL POWER TRANSMISSION IN CURVED BEAMS"
TRANSVERSE VIBRATIONS OF A THIN ELLIPTICAL PLATE WITH A CONCENTRIC, CIRCULAR FREE EDGE HOLE
COMMENTS ON "INCREASING THE NATURAL FREQUENCIES OF CIRCULAR DISKS USING INTERNAL CHANNELS"
COMMENTS ON "FUNDAMENTAL FREQUENCY OF A WAVY NON-HOMOGENEOUS CIRCULAR MEMBRANE"