diff --git a/src/main/java/intellij_awk/psi/AwkStringMixin.java b/src/main/java/intellij_awk/psi/AwkStringMixin.java
index beed79d..0b0d4f2 100644
--- a/src/main/java/intellij_awk/psi/AwkStringMixin.java
+++ b/src/main/java/intellij_awk/psi/AwkStringMixin.java
@@ -9,20 +9,37 @@
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
+import java.util.regex.Pattern;
+
+import static com.intellij.openapi.util.text.StringUtil.unquoteString;
+
 public abstract class AwkStringMixin extends AwkNamedElementImpl {
   public AwkStringMixin(@NotNull ASTNode node) {
     super(node);
   }
 
+  private static final Pattern stringThatCanBeFunctionName =
+      Pattern.compile("\"[A-Za-z_][A-Za-z0-9_]*\"");
+
+  static boolean canBeFunctionName(String s) {
+    return stringThatCanBeFunctionName.matcher(s).matches();
+  }
+
+  @Override
+  public String getName() {
+    String str = getText();
+    return canBeFunctionName(str) ? unquoteString(str) : null;
+  }
+
   public PsiElement setName(String newName) {
     return replaceNameNode(AwkElementFactory.createFunctionCallName(getProject(), newName));
   }
 
   @Override
   public PsiReference getReference() {
-//    return new AwkReferenceFunction(this, getNameTextRange());
-    return new AwkReferenceFunction(this, TextRange.from(1, getTextLength()-2));
-//    return null;
+    return getName() != null
+        ? new AwkReferenceFunction(this, TextRange.from(1, getTextLength() - 2))
+        : null;
   }
 
   @Override
diff --git a/src/test/java/intellij_awk/psi/AwkStringMixinTests.java b/src/test/java/intellij_awk/psi/AwkStringMixinTests.java
new file mode 100644
index 0000000..6e230be
--- /dev/null
+++ b/src/test/java/intellij_awk/psi/AwkStringMixinTests.java
@@ -0,0 +1,23 @@
+package intellij_awk.psi;
+
+import junit.framework.TestCase;
+import org.junit.Assert;
+
+public class AwkStringMixinTests extends TestCase {
+  public void testTrue() {
+    Assert.assertTrue(AwkStringMixin.canBeFunctionName("\"aaa\""));
+    Assert.assertTrue(AwkStringMixin.canBeFunctionName("\"_aaa01\""));
+    Assert.assertTrue(AwkStringMixin.canBeFunctionName("\"Xxx123\""));
+    Assert.assertTrue(AwkStringMixin.canBeFunctionName("\"_\""));
+    Assert.assertTrue(AwkStringMixin.canBeFunctionName("\"X\""));
+  }
+  public void testFalse() {
+    Assert.assertFalse(AwkStringMixin.canBeFunctionName(" \"aaa\" "));
+    Assert.assertFalse(AwkStringMixin.canBeFunctionName("\"111\""));
+    Assert.assertFalse(AwkStringMixin.canBeFunctionName("\"1aaa\""));
+    Assert.assertFalse(AwkStringMixin.canBeFunctionName("\"_aa a01\""));
+    Assert.assertFalse(AwkStringMixin.canBeFunctionName("\"Xxx'123\""));
+    Assert.assertFalse(AwkStringMixin.canBeFunctionName("\"-\""));
+    Assert.assertFalse(AwkStringMixin.canBeFunctionName("\"aaaa\\\"bbb\""));
+  }
+}