We know that a binary tree is a rooted tree in which each node has no more than two children. We can extend this definition to an n-ary tree. If a tree is rooted in which each node has no more than n children, it is called an n-ary tree. In other words, n ary trees are tree data structures with up to n children nodes for each node present in the tree.
Given a n-ary tree, count number of nodes which have more number of children than parents - GeeksforGeeks
Life as an N-ary Tree – My Cup of Tea
graphs - What does pre-, post- and in-order walk mean for a n-ary tree? - Computer Science Stack Exchange
Special Trees
Complete N-ary Trees
Binary/ N-ary Trees Tutorials & Notes, Data Structures
Implementing Binary Search Tree and n-ary Tree in Javascript, by Khushboo Taneja
N-ary Tree - Tree Data Structures - InterviewBit
Deep Dive into Data structures using Javascript - General (Generic, N-ary) tree - Şahin Arslan
Create a mirror of an m–ary tree
Leetcode 1522. Diameter of N-Ary Tree
n-ary tree functions (coNCePTuaL User's Guide)