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+er_B(1) -- Sample a random graph from the Erdos-Renyi model B
+======
+
+## SYNOPSIS
+
+`er_B` <N> _p_ [<fileout>]
+
+## DESCRIPTION
+
+`er_B` samples a random graph from the Erdos-Renyi model B, i.e. a
+graph with <N> nodes where each of the <N(N-1)/2> edges is created
+independently with probability _p_. 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.
+
+* _p_:
+    Edge probability.
+
+* <fileout>:
+    The (optional) name of the filename where the edge list of the
+    graph will be saved.
+
+## EXAMPLES
+
+The following command:
+
+          $ er_B 1000 0.006
+
+samples an undirected random network with <N=1000> nodes where each
+possible edge is created with probability _p=0.006_.  The output of
+the command `er_B` 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_B 1000 0.006 > er_B_1000_0.006.net
+
+will save the resulting graph in the file
+er\_B\_1000\_0.006.net. Notice the usage of the symbol "\>" to
+redirect the output of the program to a file.
+
+## SEE ALSO
+
+er_A(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>`.