Question: Which magazine maintains the ranking of fighters in the weight class which Joanna Jędrzejczyk competes within?

Context paragraphs:
List of current mixed martial arts champions: Mixed martial arts (MMA) is a form of competitive combat sport, akin to boxing, muay thai, or kick boxing.  MMA titles, or championship belts, are given to those fighters deemed by a promotional organization to have met a certain standard of athletic accomplishment in a specific weight class (most often by means of a championship fight).  Championship belts are fought for at each weight class under a promotion, with only one belt awarded per class.  Each belt is usually contested every time the belt holder fights, and passed to the victor of that fight (see the List of UFC champions for a chronology of UFC title belts).  A belt may be vacated when a fighter leaves a promotion, or is suspended.  At such times an interim champion may be crowned, or the belt may be awarded to the winner of a fight between top contenders.

List of current Bellator fighters: The Bellator MMA (formerly known as "Bellator Fighting Championships") promotion was started in 2008 by Bjorn Rebney and Brad Epstein as a tournament based alternative to other MMA organizations such as the Ultimate Fighting Championship and Strikeforce.  Prior to 2015, when president Scott Coker made the decision to drop the 8-man tournament format, Bellator fighters participated in a series of tournament bouts in a set weight class over a season (usually between 10 and 13 events over 3 or 4 months).  The winners of these tournaments were crowned Bellator champions, with the winners of successive tournaments in the same weight class earning the spot of no. 1 contender.

Weight class (boxing): A weight class is a measurement weight range for boxers.  The lower limit of a weight class is equal to the upper weight limit of the class below it.  The top class, with no upper limit, is called heavyweight in professional boxing and super heavyweight in amateur boxing.  A boxing match is usually scheduled for a fixed weight class, and each boxer's weight must not exceed the upper limit.  Although professional boxers may fight above their weight class, an amateur boxer's weight must not fall below the lower limit.  A nonstandard weight limit is called a catch weight.

Joanna Jędrzejczyk: Joanna Jędrzejczyk (] ; born August 18, 1987) is a Polish mixed martial artist and former Muay Thai kickboxer who competes in the women's strawweight division of the Ultimate Fighting Championship.  She is the current UFC Women's Strawweight Champion and the third European (and only Polish) champion in UFC history after Bas Rutten in 1999 and Andrei Arlovski in 2005.  As of May 2017, she is the consensus #1 female strawweight, and #1 pound-for-pound female MMA fighter in the world.  She is also currently the #8 pound-for-pound fighter in the UFC mixed gender rankings, making her the top female on the list.

K-1 World MAX 2005 Championship Final: K-1 World MAX 2005 Championship Final was a kickboxing event promoted by the K-1 organization.  It was the fourth K-1 World MAX final for middleweight kickboxers (70 kg/152 lb weight class), involving eight finalists and two reserve fighters, with all bouts fought under K-1 rules.  All eight of the finalists had won elimination fights at the K-1 World MAX 2005 World Tournament Open, while the reserve fighters were invited despite suffering defeats.  As well as tournament matches there were also three super fights fought under K-1 rules (70 kg/152 lb weight class).  In total there were sixteen fighters at the event, representing nine countries.

Professional wrestling weight classes: In professional wrestling, a weight class is a standardized weight range for the wrestlers.  The top class in almost every promotion is heavyweight, but super heavyweights exist.  Weight class matches in modern-day American professional wrestling are rare, but weight class championships still exist.  However, Japanese professional wrestling, Mexican wrestling and British wrestling use the weight classes more seriously.

Lineal championship: In combat sports where champions are decided by a challenge, the lineal championship of a weight class is a world championship title held initially by an undisputed champion and subsequently by a fighter who defeats the reigning champion in a match at that weight class.  In professional boxing, the lineal champion is informally called "the man who beat the man".  Champions recognized by sanctioning bodies such as the World Boxing Association (WBA) or World Boxing Council (WBC), or the Ultimate Fighting Championship (UFC) may vacate their title voluntarily, or be stripped of the title for breaching the sanctioning body's regulations or contracts.  There will thus be a breach of continuity in the list of sanctioned champions which the lineal championship is intended to prevent.  However, there is no single canonical list of lineal champions at any weight class, because there is no agreed upon method of determining the starting point for each lineage and conflicting opinions on what to do when the current champion retires or moves to a different weight class, although there is agreement that any stripping of a title be discounted.

Taekwondo weight classes: In taekwondo, a weight class is a standardized weight range for taekwondo practitioners.  The upper weight limit for each class is the lower limit of the next highest class.  A taekwondo gyeorugi is usually scheduled for a fixed weight class, and each practitioner's weight must not exceed the upper limit.

Ekaterina Vandaryeva: Ekaterina Vandaryeva (born January 20, 1991) is a Belarusian kickboxer who defeated future UFC champion Joanna Jędrzejczyk in a controversial judges' decision to become the WKN champion in 2011.

Pound for pound: Pound for pound is a ranking used in combat sports, such as boxing or mixed martial arts, of who the better fighters are relative to their weight (i.e., adjusted to compensate for weight class).  As these fighters do not compete directly, judging the best fighter pound for pound is subjective, and ratings vary.  They may be based on a range of criteria including "quality of opposition", factors such as how exciting the fighter is or how famous they are, or be an attempt to determine who would win if all those ranked were the same size.  In boxing, the term was historically associated with fighters such as Benny Leonard and Sugar Ray Robinson who were widely considered to be the most skilled fighters of their day, to distinguish them from the generally more popular (and better compensated) heavyweight champions.  Since 1990, "The Ring" magazine has maintained a pound for pound rank of fighters.  ESPN.com has a list for mixed martial artists.  In December 2013, Ronda Rousey became the first woman to appear on the top 10 of a mixed-gender major publication.

Supporting paragraphs: Joanna Jędrzejczyk Pound for pound
Answer: The Ring