graph.dot

digraph biblography {

    subgraph cluster_lr {
        label = "LR"
            "lr"[xlabel=1965]
    }

    subgraph cluster_tn {
        label = "Transition networks"
            "tn"[xlabel=1970]
    }

    subgraph cluster_earley {
        label = "Earley"
            "earley"[xlabel=1970]
            "practical-earley"[xlabel=2002]
            "ecfg-earley"[xlabel=2010]

            "practical-earley" -> "earley"
            "ecfg-earley" -> "earley"
            "ecfg-earley" -> "tn"
            "ecfg-earley" -> "practical-earley"
    }

    "lecture-notes-compiler-construction"[xlabel=1974, shape=box]
    "lecture-notes-compiler-construction" -> "lr"
    "lecture-notes-compiler-construction" -> "earley"
    "parsingtechniques"[xlabel=2008,shape=box]
    "parsingtechniques" -> "lr"
    "parsingtechniques" -> "earley"
    "parsingtechniques" -> "snslr"
    "dragonbook"[xlabel=2006,shape=box]

    subgraph cluster_minimal_lr {
        label = "Minimal LR"

        "pager-tracing"[xlabel=1973]
        "pager-minimal"[xlabel=1977]
        "pager-tracing2"[xlabel=2009]
        "chen-minimal"[xlabel=2011]
        "pager-firstk"[xlabel=2013]
        "ielr"[xlabel=2010]

        "pager-tracing" -> "lr"
        "pager-minimal" -> "pager-tracing" 
        "pager-tracing2" -> "pager-tracing"
        "chen-minimal" -> "pager-tracing"
        "pager-firstk" -> "chen-minimal"
        "ielr" -> "pager-tracing"
        "ielr" -> "pager-minimal"
    }

    subgraph cluster_scanning {
        label = "Scanning"

        "snslr"[xlabel=1989]
        "nawrocki-scanning"[xlabel=1991]
        "keynes-scanning"[xlabel=2007]
        "pslr"[xlabel=2010]
        "context-aware"[xlabel=2007]
        "context-aware-thesis"[xlabel=2010]

        "keynes-scanning" -> "nawrocki-scanning" 
        "keynes-scanning" -> "snslr"
        "pslr" -> "ielr"
        "pslr" -> "keynes-scanning"
        "pslr" -> "context-aware"
        "pslr" -> "context-aware-thesis"
        "context-aware-thesis" -> "pslr"
    }





}