Table 2.

The list of top 10 countries contributed to the publications on NMU researches from 1987 to 2021.

Rank	Country	Frequency	Citation counts	H-index
1	USA	87	2,149	27
2	JAPAN	80	777	15
3	PEOPLES R CHINA	48	454	9
4	ENGLAND	23	665	13
5	BELGIUM	18	140	8
6	POLAND	18	119	8
7	GERMANY	17	552	9
8	ITALY	16	61	4
9	DENMARK	13	422	7
10	SWEDEN	11	108	6