Non completely solvable systems of complex first order PDEs C. Denson Hill, Mauro Nacinovich (2013) Rendiconti del Seminario Matematico della Università di Padova
Non-holonomic modules over Weyl algebras and enveloping algebras. J.T. Stafford (1985) Inventiones mathematicae
Nonsplit extensions of modular Lie algebras of rank 2. Dzhumadil'daev, A.S., Ibraev, S.S. (2002) Homology, Homotopy and Applications
Nonsymmetric Koornwinder polynomials and duality. Sahi, Siddhartha (1999) Annals of Mathematics. Second Series
Number of “ u d u ”s of a Dyck path and a d -nilpotent ideals of parabolic subalgebras of sl ℓ + 1 ( C ) . Righi, Céline (2007) Séminaire Lotharingien de Combinatoire [electronic only]