Getting the page by passing it's content

I've a class like

public class IndustryPage 
{

[CultureSpecific]
[Display(
Name = "Categories",
Description = "Categories",
GroupName = SystemTabNames.Content,
Order = 30)]
[AllowedTypes(typeof(CategoryPage))]
public virtual IList<ContentReference> Categories { get; set; }

}

Not i want to find industry pages by passing categories(contentrefernce) list.

Can someone help me in this?