add missing references to book by Wilks (2011)

include/evalhyd/detail/probabilist/brier.hpp

@@ -6,6 +6,13 @@
 #include <xtensor/xmasked_view.hpp>
 
 
+// NOTE ------------------------------------------------------------------------
+// All equations in metrics below are following notations from
+// "Wilks, D. S. (2011). Statistical methods in the atmospheric sciences.
+// Amsterdam; Boston: Elsevier Academic Press. ISBN: 9780123850225".
+// In particular, pp. 302-303, 332-333.
+// -----------------------------------------------------------------------------
+
 namespace evalhyd
 {
     namespace probabilist

include/evalhyd/detail/probabilist/contingency.hpp

@@ -6,6 +6,7 @@
 #include <xtensor/xmasked_view.hpp>
 #include <xtensor/xmath.hpp>
 
+
 // NOTE ------------------------------------------------------------------------
 // All equations in metrics below are following notations from
 // "Wilks, D. S. (2011). Statistical methods in the atmospheric sciences.
@@ -13,7 +14,6 @@
 // In particular, pp. 302-303, 332-333.
 // -----------------------------------------------------------------------------
 
-
 namespace evalhyd
 {
     namespace probabilist

include/evalhyd/detail/probabilist/quantiles.hpp

@@ -6,6 +6,13 @@
 #include <xtensor/xsort.hpp>
 
 
+// NOTE ------------------------------------------------------------------------
+// All equations in metrics below are following notations from
+// "Wilks, D. S. (2011). Statistical methods in the atmospheric sciences.
+// Amsterdam; Boston: Elsevier Academic Press. ISBN: 9780123850225".
+// In particular, pp. 302-303, 332-333.
+// -----------------------------------------------------------------------------
+
 namespace evalhyd
 {
     namespace probabilist