This is the 17195th most frequent Russian word.
стоящие
"Standing" or "worthwhile," depending on context.
In this sentence, 'стоящие' is used adjectivally to mean 'worthwhile,' indicating that the negotiations were valuable.
Это были стоящие усилий переговоры.
These were negotiations worth the effort.
Here, 'стоящие' is used to describe people in the act of standing, functioning as a participle to depict their position at the entrance.
Люди, стоящие у входа, были очень дружелюбны.
The people standing at the entrance were very friendly.
In this instance, 'стоящие' refers to books that are worth her attention and useful for her research, exhibiting its evaluative usage as an adjective.