| MinByTSource, TKey(IEnumerableTSource, FuncTSource, TKey) | Returns the minimal elements of the given sequence, based on
            the given projection. Obsolete. | 
| MinByTSource, TKey(IEnumerableTSource, FuncTSource, TKey, IComparerTKey) | Returns the minimal elements of the given sequence, based on
            the given projection and the specified comparer for projected values. Obsolete. |