1 files changed, 69 insertions, 0 deletions
diff --git a/doc/er_A.md b/doc/er_A.md
new file mode 100644
index 0000000..0019c4b
--- /dev/null
+++ b/doc/er_A.md
@@ -0,0 +1,69 @@
+er_A(1) -- Sample a random graph from the Erdos-Renyi model A
+======
+
+## SYNOPSIS
+
+`er_A` <N> <K> [<fileout>]
+
+## DESCRIPTION
+
+`er_A` samples a random graph with <N> nodes and <K> edges from the
+Erdos-Renyi model A, i.e. the ensemble of random graphs where K links
+are placed uniformly at random among N nodes. The program dumps the
+edge list of the resulting graph on output. If the optional <fileout>
+is provided, the output is written on a file with that name.
+
+## PARAMETERS
+
+* <N>:
+    Number of nodes in the final graph.
+
+* <K>:
+    Number of edges in the final graph.
+
+* <fileout>:
+    The (optional) name of the filename where the edge list of the
+    graph will be saved.
+
+## EXAMPLES
+
+The following command:
+
+         $ er_A 1000 3000
+
+samples an undirected random network with <N=1000> nodes and <K=3000>
+edges using the Erdos-Renyi model A. The output of the command `er_A`
+will be the edge-list of the resulting graph, where each (undirected)
+edge is reported only once. In order to be useful, such edge-list
+should be saved into a file. The following command:
+
+          $ er_A 1000 3000 > er_A_1000_3000.net
+
+will save the resulting graph in the file er\_A\_1000\_3000.net. Notice
+the usage of the symbol "\>" to redirect the output of the program to a
+file.
+
+## SEE ALSO
+
+er_B(1), ws(1)
+
+## REFERENCES
+
+* P\. Erdos, & A. Rényi, "On Random Graphs I", Publ. Math. Debrecen, 6,
+  290 (1959)
+
+* P\.Erdos, & A. Renyi, "On the evolution of random graphs"
+  Publ. Math. Inst. Hungary. Acad. Sci., 5, 17-61 (1960)
+
+* V\. Latora, V. Nicosia, G. Russo, "Complex Networks: Principles,
+  Methods and Applications", Chapter 3, Cambridge University Press
+  (2017)
+
+* V\. Latora, V. Nicosia, G. Russo, "Complex Networks: Principles,
+  Methods and Applications", Appendix 10, Cambridge University Press
+  (2017)
+
+
+## AUTHORS
+
+(c) Vincenzo 'KatolaZ' Nicosia 2009-2017 `<v.nicosia@qmul.ac.uk>`.