The phrase 'gap in the studies' is correct and usable in written English.
You can use it to refer to research that has been done to address a particular issue but has not provided a satisfactory answer. For example, "Despite the extensive research on the effects of second-hand smoke, there is still a gap in the studies regarding the long-term health consequences of exposure."
A25 EDUCATION B8 Boys, Girls and Geography A gender gap in the study of geography is now so wide that boys are 45 times more likely to be finalists in the National Geography Bee.
One of our aims is to fulfill the possible gap in the study of the equation.
So the results obtained in this paper fill in the gap in the study of problem (1.1 - 1.2 1.1 - 1.2
Our main purpose in this paper is to contribute to the literature trying to fill partially this gap in the study of singularities of mixed type with an approach that should be useful as a starting point for further studies.
As for any semi-Riemannian manifold, there is a natural existence of lightlike subspaces, Duggal and Bejancu published their work [3] on the general theory of lightlike submanifolds to fill a gap in the study of submanifolds.
Given the growing academic and professional interest to improve export processes' management and the existent gap in the study of down-stream inter-organisational relationships, the present study aims at the exploration of management control systems (MCS) in the context of export channels.
This study helps fill an existing gap in the study of technological applications in the care of children and improves knowledge about how HIE systems are utilized.
The absence of these sequences, which included the PE proteins belonging to the ESAT-6 (esx) gene cluster regions 1 (Rv3872/PE35), 2 (Rv3893c/PE36) and 3 (Rv0285/PE5), left a major gap in the study of the evolutionary expansion of this family.
While there is a broad field of research that analyzes pharmacological treatments in the middle aged population, there is a substantial knowledge gap in the study of pharmacotherapy in elderly patients [ 3].
Thus, a deeper understanding is required about how the parents and community at large perceive sexual relations after childbirth in relation to health as a contribution to reducing the knowledge gap in the study setting.
