Expression of concern: Unsteady slip flow of special second–grade fluid induced by Fe3O4 particles past a movable sheet with magnetic and nonlinear heat source/sink

The publisher of International Journal of Numerical Methods for Heat and Fluid Flow is issuing an Expression of Concern for the article Khan, U., Zaib, A., Ishak, A., Sherif, E.S.M. and Wróblewski, P. (2024), “Unsteady slip flow of special second–grade fluid induced by Fe3O4 particles past a movable sheet with magnetic and nonlinear heat source/sink”, International Journal of Numerical Methods for Heat and Fluid Flow, Vol. 34 No. 6, pp. 2321-2344, Link to the cited article, to inform readers that concerns have been raised regarding its authorship. An investigation is ongoing and is currently unresolved. The authors of this article would like to note that they do not agree with the content of this notice. Further information will be provided by the International Journal of Numerical Methods for Heat and Fluid Flow as it becomes available.