diff --git a/src/util-dict-bst.scm b/src/util-dict-bst.scm
index 7f74df7..8d86c35 100644
--- a/src/util-dict-bst.scm
+++ b/src/util-dict-bst.scm
@@ -51,6 +51,10 @@
   bdict-values
 
   bdict-balance
+
+  bdict-filter-pairs
+  bdict-filter-keys
+  bdict-filter-values
   
   bdict-tests!
   )
@@ -270,9 +274,38 @@
    (vector->bdict
     (bdict->vector d)))
 
- ;; Returns a list
- (define (bdict-filter d p)
-   '())
+ ;; Returns a list of key-value pairs matching predicate
+ (define (bdict-filter-pairs d p)
+   (bdict-reduce
+    '()
+    (lambda (a k v)
+      (let ((e (p k v)))
+	(if e
+	    (cons (cons k v) a)
+	    a)))
+    d))
+
+ ;; Returns a list of keys pairs matching predicate
+ (define (bdict-filter-keys d p)
+   (bdict-reduce
+    '()
+    (lambda (a k v)
+      (let ((e (p k v)))
+	(if e
+	    (cons k a)
+	    a)))
+    d))
+
+ ;; Returns a list of keys pairs matching predicate
+ (define (bdict-filter-values d p)
+   (bdict-reduce
+    '()
+    (lambda (a k v)
+      (let ((e (p k v)))
+	(if e
+	    (cons v a)
+	    a)))
+    d))
 
  ;; Performs module self-tests
  (define (bdict-tests!)