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 Some mathematics revision: Calculus II,  


 Calculus III - Laplace's Eqn and Curvilinear Coordinates, etc


  Some extra notes on the Kronecker delta and Levi-Civita epsilon:


  Some introductory notes on Tensors: 














  Some papers on the Time Irreversibility of physical systems:





 Paper: Survival in the first hours of the Cenozoic - D. Robertson et al. 


 Contemporaneous Mass Extinctions


  Probable Asteroidal Origin of the Tunguska Cosmic Body - P. Farinella, et al.