Get titles from arXiv's Stat.ML

Titles.fs

open System.Xml.Linq
open FSharp.Data

/// Use F#'s awesome type provider to access arXiv's API.
type StatML = XmlProvider<"http://export.arxiv.org/api/query?search_query=stat.ML&start=0&max_results=1000">

/// Request Stat.ML articles from 'a' to 'b'.
let APIReq (a: int) (b: int) =
    "http://export.arxiv.org/api/query?search_query=stat.ML&start=" + (string a) + "&max_results=" + (string b)

/// Get titles from 'a' to 'b' (e.g. StatMLTitles 0 1000, StatMLTitles 4247 6381). Store the titles in 
/// a set object (sorted automatically).
let StatMLTitles a b =
    (Set.empty, StatML.Load(APIReq a b).GetEntries())
    ||> Array.fold (fun acc e -> Set.add e.Title acc)