Kosmala, Witold A. J. "More on Oscillation of nth-Order Equations" Georgian Mathematical Journal, 2.6 (2010): 593-602. Retrieved 25 May. 2013, from doi:10.1515/GMJ.1995.593

Kosmala, W. (2010). More on Oscillation of nth-Order Equations. Georgian Mathematical Journal, 2(6), pp. 559-657. Retrieved 25 May. 2013, from doi:10.1515/GMJ.1995.593

Kosmala, Witold A. J. 2010. More on Oscillation of nth-Order Equations. Georgian Mathematical Journal. 2(6): 559-657. Retrieved 25 May. 2013, from doi:10.1515/GMJ.1995.593