@bookinthesis{inphd:2015,
    Author = {Aristotle},
    Title = {The Ancient Text},
    Crossref = {phd:2015},
    Pages = {20--55}
}
@thesis{phd:2015,
    Address = {Paris},
    Author = {John Doe},
    Institution = {Sorbonne},
    Title = {A Nice Title},
    Type = {thesis},
    Subtitle = {A Very Nice Subtitle},
    Year = {2015}}