Add Richter's paper and others.

Author: ltratt

softdev.bib

@@ -2339,3 +2339,37 @@ @inproceedings{zook04generating
     month = Oct,
     organization = "Springer"
 }
+
+@article{richter85noncorrecting,
+    author = "Richter, Helmut",
+    title = "Noncorrecting Syntax Error Recovery",
+    journal = "TOPLAS",
+    volume = 7,
+    number = 3,
+    month = Jul,
+    year = 1985,
+    pages = {478--489},
+    doi = {10.1145/3916.4019},
+}
+
+@article{earley73efficient,
+    author = "Earley, Jay",
+    title = "An Efficient Context-free Parsing Algorithm",
+    journal = "Commun. {ACM}",
+    volume = 13,
+    number = 2,
+    month = Feb,
+    year = 1970,
+    pages = {94--102},
+    doi = {10.1145/362007.362035},
+}
+
+@techreport{deudekom93initial,
+    author = "Arthur van Deudekom and Dick Grune and Peter Kooiman",
+    title = "Initial experience with noncorrecting syntax error handling"
+    number = "IR-339"
+    institution = "Vrije Universiteit, Amsterdam"
+    pages = "11",
+    month = Nov,
+    year = 1993
+}