maxflow: add cite to HPEC25 paper

Author: DrTimothyAldenDavis

experimental/algorithm/LAGr_MaxFlow.c

@@ -23,6 +23,13 @@
 // (eds) Algorithms - ESA 2015. Lecture Notes in Computer Science(), vol 9294.
 // Springer, Berlin, Heidelberg.  https://doi.org/10.1007/978-3-662-48350-3 10.
 
+// [2] D. Peries and T. Davis, "A parallel push-relabel maximum flow algorithm
+// in LAGraph and GraphBLAS", IEEE HPEC'25, Sept 2025.
+
+// TODO: return the (optional) flow matrix can be costly in terms of run time.
+// The HPEC'25 results only benchmark the computation of the max flow, f.
+// Future work:  we plan on revising how the flow matrix is constructed.
+
 #include <LAGraphX.h>
 #include "LG_internal.h"
 #include <LAGraph.h>

experimental/benchmark/do_maxflow

@@ -8,8 +8,10 @@ GAP="/home/davis/GAP"
 ../../build/experimental/benchmark/maxflow_demo $MTX/com-Youtube.mtx 4 275
 ../../build/experimental/benchmark/maxflow_demo $MTX/com-LiveJournal.mtx 2 88
 ../../build/experimental/benchmark/maxflow_demo $MTX/com-Orkut.mtx 43 75
-../../build/experimental/benchmark/maxflow_demo $GAP/GAP-road/GAP-road.grb 4 1075
 ../../build/experimental/benchmark/maxflow_demo $GAP/GAP-twitter/GAP-twitter.grb 13 17
 
+# takes a *very* long time when computing the flow matrix:
+../../build/experimental/benchmark/maxflow_demo $GAP/GAP-road/GAP-road.grb 4 1075
+
 # too large for hyper (needs > 128GB of RAM)
 # ../../build/experimental/benchmark/maxflow_demo $GAP/GAP-web/GAP-web.grb 64712 500