An approximation to solution of space and time fractional telegraph equations by He's variational iteration method. Sevimlican, Ali (2010) Mathematical Problems in Engineering
An efficient applications of He's variational iteration method based on a reliable modification of Adomian algorithm for nonlinear boundary value problems. Golbabai, A., Sayevand, K. (2010) The Journal of Nonlinear Sciences and its Applications
Approximate general solution of degenerate parabolic equations related to population genetics. Amano, Kazuo (1995) Electronic Journal of Differential Equations (EJDE) [electronic only]
Approximate Solutions Of The Operator Linear Differential Equation II D. Herceg, B. Stanković (1977) Publications de l'Institut Mathématique
Approximate solutions of the operator linear differential equation I. B. Stankovic (1977) Publications de l'Institut Mathématique [Elektronische Ressource]
Approximation d'équations aux dérivées partielles par des méthodes de décomposition Roger Temam (1969/1970) Séminaire Bourbaki
Approximation von Eigenwertproblemen bei nichtlinearer Parameterabhängigkeit. Hansgeorg Jeggle, Rolf D. Grigorieff (1973) Manuscripta mathematica