  // Refernces
  var Observable = Rx.Observable,
    observableProto = Observable.prototype,
    AnonymousObservable = Rx.AnonymousObservable,
    observableDefer = Observable.defer,
    observableEmpty = Observable.empty,
    observableNever = Observable.never,
    observableThrow = Observable.throwException,
    observableFromArray = Observable.fromArray,
    timeoutScheduler = Rx.Scheduler.timeout,
    SingleAssignmentDisposable = Rx.SingleAssignmentDisposable,
    SerialDisposable = Rx.SerialDisposable,
    CompositeDisposable = Rx.CompositeDisposable,
    RefCountDisposable = Rx.RefCountDisposable,
    Subject = Rx.Subject,
    addRef = Rx.internals.addRef,
    normalizeTime = Rx.Scheduler.normalize,
    helpers = Rx.helpers,
    isPromise = helpers.isPromise,
    isScheduler = helpers.isScheduler,
    observableFromPromise = Observable.fromPromise,
    notDefined = helpers.notDefined;
