1. Ahmed S. U.(1999) US Patent No.5869597.
2. Ahmed S. U. Van Lith G. J.(1999) Fibers comprising water soluble polyamides and articles constructed therefrom. US Patent No.5869596.
3. Alexy P. Bakos D. Kolomaznik K. Sedlak M.andSedlakova E.(2000)Int. Pat. PCT Int. Appl. WO20001019.
4. Assessment of Environmental Biodegradation of Synthetic Polymers