1. Pall leukocyte depleting filter during cardiopulmonary bypass;Allen;Ann. Thorac. Surg.,1994
2. Development of needle-punched nonwoven fabrics from flax fibers for air filtration applications;Anandjivala;Text. Res. J.,2008
3. Ando, K., Ogawa, Y., 1985. Electret fiber sheet and method of producing same, US patent 4,874,659.
4. Battenfeld, J.; Widrig, W.E.; Nofz, E., Filter media with fibrillated fibers, US 9027765, 2015.
5. Beer, M., Rosendahl, M., Stausberg, W., 2005. Multilayer composite filter medium for serial filtration, US patent 6,840,387.