Laravel 5.2 NotFoundHttpException in RouteCollection.php line 161: （showアクション使用）

前提・実現したいこと

Laravel 5.2でブログ投稿サイトを作っています。
トップページから記事の詳細にアクセスできる機能を実装しようと試みたところ表題のエラーが発生しました。

発生している問題・エラーメッセージ

NotFoundHttpException in RouteCollection.php line 161:

なお、php artisan route:listでルーティングを確認したところ、routes.phpにおそらく間違いなく記載しているのにも関わらず、showアクションが表示されていません。

**ArticlesController.php**

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Http\Requests;
use App\Article;
use Auth;

class ArticlesController extends Controller {
    public function __construct() {
        $this->middleware('auth', array('except' => 'index'));
    }
    public function index() {
        $articles = Article::orderBy('id', 'DESC')->paginate(5);
        return view('articles.index')->with('articles', $articles);
    }
    public function create() {
        return view('articles.create');
    }
    public function store(Request $request) {
        Article::create(
            array(
                'category' => $request->category,
                'title' => $request->title,
                'image_url' => $request->image_url,
                'text' => $request->text,
                'user_id' => Auth::user()->id
            )
        );
        return view('articles.store');
    }
    public function show($id) {
        $article = Article::find($id);
        return view('articles.show')->with('article', $article);
    }
}

**routes.php**

<?php
use App\Http\Controllers\ArticlesController;

Route::group(['middleware' => ['web']], function () {
    Route::auth();
    Route::get('/', 'ArticlesController@index');
    Route::get('/articles', 'ArticlesController@index');
    Route::get('/articles/{id}', 'ArticlesController@show');
    Route::get('/articles/create', 'ArticlesController@create');
    Route::post('/articles/store', 'ArticlesController@store');
});

**コマンドライン**

+--------+----------+-------------------------+------+-----------------------------------------------------------------+------------+
| Domain | Method   | URI                     | Name | Action                                                          | Middleware |
+--------+----------+-------------------------+------+-----------------------------------------------------------------+------------+
|        | GET|HEAD | /                       |      | App\Http\Controllers\ArticlesController@index                   | web        |
|        | GET|HEAD | articles                |      | App\Http\Controllers\ArticlesController@index                   | web        |
|        | GET|HEAD | articles/create         |      | App\Http\Controllers\ArticlesController@create                  | web,auth   |
|        | POST     | articles/store          |      | App\Http\Controllers\ArticlesController@store                   | web,auth   |
|        | POST     | login                   |      | App\Http\Controllers\Auth\AuthController@login                  | web,guest  |
|        | GET|HEAD | login                   |      | App\Http\Controllers\Auth\AuthController@showLoginForm          | web,guest  |
|        | GET|HEAD | logout                  |      | App\Http\Controllers\Auth\AuthController@logout                 | web        |
|        | POST     | password/email          |      | App\Http\Controllers\Auth\PasswordController@sendResetLinkEmail | web,guest  |
|        | POST     | password/reset          |      | App\Http\Controllers\Auth\PasswordController@reset              | web,guest  |
|        | GET|HEAD | password/reset/{token?} |      | App\Http\Controllers\Auth\PasswordController@showResetForm      | web,guest  |
|        | POST     | register                |      | App\Http\Controllers\Auth\AuthController@register               | web,guest  |
|        | GET|HEAD | register                |      | App\Http\Controllers\Auth\AuthController@showRegistrationForm   | web,guest  |
+--------+----------+-------------------------+------+-----------------------------------------------------------------+------------+