Removing external API link

README.md

@@ -94,13 +94,13 @@ function strength() {
 }
 ```
 
-The strength accessor is invoked for each [node](#simulation_nodes) in the simulation, being passed the *node* and its zero-based *index*. The resulting number is then stored internally, such that the strength of each node is only recomputed when the force is initialized or when this method is called with a new *strength*, and not on every application of the force.
+The strength accessor is invoked for each node in the simulation, being passed the *node* and its zero-based *index*. The resulting number is then stored internally, such that the strength of each node is only recomputed when the force is initialized or when this method is called with a new *strength*, and not on every application of the force.
 
 <a name="manyBody_theta" href="#manyBody_theta">#</a> <i>manyBody</i>.<b>theta</b>([<i>theta</i>]) [<>](https://github.com/twosixlabs/d3-force-reuse/blob/master/src/manyBodyReuse.js#L148 "Source")
 
 If *theta* is specified, sets the Barnes–Hut approximation criterion to the specified number and returns this force. If *theta* is not specified, returns the current value, which defaults to 0.9.
 
-To accelerate computation, this force implements the [Barnes–Hut approximation](http://en.wikipedia.org/wiki/Barnes–Hut_simulation) which takes O(*n* log *n*) per application where *n* is the number of [nodes](#simulation_nodes). For each application, a [quadtree](https://github.com/d3/d3-quadtree) stores the current node positions; then for each node, the combined force of all other nodes on the given node is computed. For a cluster of nodes that is far away, the charge force can be approximated by treating the cluster as a single, larger node. The *theta* parameter determines the accuracy of the approximation: if the ratio *w* / *l* of the width *w* of the quadtree cell to the distance *l* from the node to the cell’s center of mass is less than *theta*, all nodes in the given cell are treated as a single node rather than individually.
+To accelerate computation, this force implements the [Barnes–Hut approximation](http://en.wikipedia.org/wiki/Barnes–Hut_simulation) which takes O(*n* log *n*) per application where *n* is the number of nodes. For each application, a [quadtree](https://github.com/d3/d3-quadtree) stores the current node positions; then for each node, the combined force of all other nodes on the given node is computed. For a cluster of nodes that is far away, the charge force can be approximated by treating the cluster as a single, larger node. The *theta* parameter determines the accuracy of the approximation: if the ratio *w* / *l* of the width *w* of the quadtree cell to the distance *l* from the node to the cell’s center of mass is less than *theta*, all nodes in the given cell are treated as a single node rather than individually.
 
 <a name="manyBody_distanceMin" href="#manyBody_distanceMin">#</a> <i>manyBody</i>.<b>distanceMin</b>([<i>distance</i>]) [<>](https://github.com/twosixlabs/d3-force-reuse/blob/master/src/manyBodyReuse.js#L140 "Source")