diff --git a/src/classes/PMsrHandler.cpp b/src/classes/PMsrHandler.cpp
index 15322e04..e9836ef6 100644
--- a/src/classes/PMsrHandler.cpp
+++ b/src/classes/PMsrHandler.cpp
@@ -6572,6 +6572,32 @@ std::string PMsrHandler::GetDKSTheoryString()
       result += ", ";
       result += args[4].Data();
       result += ")";
+    } else if (fTheory[i].fLine.BeginsWith("internFldGK ", TString::kIgnoreCase) ||
+               fTheory[i].fLine.BeginsWith("ifgk ", TString::kIgnoreCase)) { // if -> ifgk(t, alpha, nu, lambdaT, lambdaL, beta)
+      result += "ifgk(t, ";
+      result += args[0].Data();
+      result += ", ";
+      result += args[1].Data();
+      result += ", ";
+      result += args[2].Data();
+      result += ", ";
+      result += args[3].Data();
+      result += ", ";
+      result += args[4].Data();
+      result += ")";
+    } else if (fTheory[i].fLine.BeginsWith("internFldLL ", TString::kIgnoreCase) ||
+               fTheory[i].fLine.BeginsWith("ifll ", TString::kIgnoreCase)) { // if -> ifll(t, alpha, nu, lambdaT, lambdaL, beta)
+      result += "ifll(t, ";
+      result += args[0].Data();
+      result += ", ";
+      result += args[1].Data();
+      result += ", ";
+      result += args[2].Data();
+      result += ", ";
+      result += args[3].Data();
+      result += ", ";
+      result += args[4].Data();
+      result += ")";
     } else if (fTheory[i].fLine.BeginsWith("Bessel ", TString::kIgnoreCase) ||
                fTheory[i].fLine.BeginsWith("b ")) { // b -> b(t, phi, nu)