diff --git a/app/controllers/documents_controller.rb b/app/controllers/documents_controller.rb
index 541a9c6..181ced2 100644
--- a/app/controllers/documents_controller.rb
+++ b/app/controllers/documents_controller.rb
@@ -15,6 +15,10 @@ class DocumentsController < ApplicationController
 
   def show
     @doctrines = @document.doctrines
+
+    where = { enabled: true, state: "published" }
+    @cited_in_documents = @document.class.citing_docs_of(document, where)
+    # @cross_ref_documents = @document.class.cited_docs_of(document, where)
   end
 
   def search
diff --git a/app/models/cdao/citation.rb b/app/models/cdao/citation.rb
new file mode 100644
index 0000000..ca1947a
--- /dev/null
+++ b/app/models/cdao/citation.rb
@@ -0,0 +1,3 @@
+class Cdao::Citation < Cdao::Base
+  self.table_name = "citations"
+end
diff --git a/app/models/cdao/jurisprudence.rb b/app/models/cdao/jurisprudence.rb
index daa960b..b9ebcb9 100644
--- a/app/models/cdao/jurisprudence.rb
+++ b/app/models/cdao/jurisprudence.rb
@@ -10,6 +10,43 @@ class Cdao::Jurisprudence < Cdao::Base
 
   alias_attribute :doc_date, :docdate
 
+  def cited_documents
+    Cdao::Citation.where(citing_doc_id: self.id, citing_doc_type: self.class.name.gsub("Cdao::", ""))
+  end
+
+  def citing_documents
+    Cdao::Citation.where(cited_doc_id: self.id, cited_doc_type: self.class.name.gsub("Cdao::", ""))
+  end
+
+  def self.citing_docs_of(doc, where = {})
+    citing_docs = []
+    c_arel = Cdao::Citation.arel_table
+    default_where = c_arel[:citing_doc_type].not_eq(nil).and(c_arel[:citing_doc_id].not_eq(nil))
+    doc.citing_documents.where(where).where(default_where).group_by(&:citing_doc_type).each do |klass_type, records|
+      next unless klass_type.match?(/Jurisprudence/)
+
+      klass = "Cdao::#{klass_type}".safe_constantize
+      attr = klass.column_names.map(&:to_sym) - [:content]
+      citing_docs.concat(klass.select(*attr).where(id: records.map(&:citing_doc_id)))
+    end
+    citing_docs
+  end
+
+  def self.cited_docs_of(doc, where = {})
+    cited_docs = []
+    c_arel = Cdao::Citation.arel_table
+    default_where = c_arel[:cited_doc_type].not_eq(nil).and(c_arel[:cited_doc_id].not_eq(nil))
+    doc.cited_documents.where(where).where(default_where).group_by(&:cited_doc_type).each do |klass_type, records|
+      next unless klass_type.match?(/Jurisprudence/)
+
+      klass = "Cdao::#{klass_type}".safe_constantize
+      attr = klass.column_names.map(&:to_sym) - [:content]
+      docs = klass.select(*attr).where(id: records.filter_map(&:cited_doc_id))
+      cited_docs.concat(docs)
+    end
+    cited_docs
+  end
+  
   def subjects
     doctrines.map(&:subjects).flatten.uniq
   end