How to design an asynchronous counter using JK flip for getting the following sequence 0-2-4-7-9-0 - Quora
flipflop - Why use JK Flip Flops in syncronous/asyncronous binary counters rather than D flip flops? - Electrical Engineering Stack Exchange
How to implement a 3 bit odd counter with JK flip flops - Quora
How to design a synchronous counter 4 bit using JK flip flop that can count up even numbers from 0 to 14, and count down odd numbers from 15 to 0 in 1 system - Quora
JK Flip Flop - Basic Online Digital Electronics Course
verilog - Synchronous Counter using JK flip-flop not behaves as expected - Stack Overflow