Question: Which publication revealed that ABC would be producing a spin-off of Grey's Anatomy?
About the article "Private Practice (TV series)", section "Origins".

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Production history.
On , ":The Wall Street Journal" reported that ABC was pursuing a spin-off of "Grey's Anatomy" featuring Kate Walsh's character Addison Montgomery.
Subsequent reports confirmed the report, stating that an expanded two-hour broadcast of "Grey's Anatomy" (which aired ) would serve as a backdoor pilot for the spinoff.
The backdoor pilot episode features Montgomery on leave from Seattle Grace Hospital, the clinic in Los Angeles is named the Oceanside Wellness Centre.
The broadcast served as the 22nd and 23rd episodes of the season (out of 25), and was directed by Michael Grossman, according to "Variety".
Gossip columnists Kristin Veitch and Michael Ausiello reported that the spinoff would be set in Los Angeles.
After playing Cathy Buxton in the ' episode "Stakeout" in 1996 and Navy Lieutenant Kirstin Blair in the "Law & Order" episode "Navy Blues".
Her first major television appearance was in 1997, when she appeared on "The Drew Carey Show" as Drew Carey's love interest, Nicki Fifer.
She wore a fatsuit in some episodes of the show, as the Nicki character was a formerly obese woman who lost weight and slowly started to gain it back.
She went on to portray Carol Nelson in HBO's "The Mind of the Married Man" television series, and played Norm Macdonald's romantic interest in the sitcom "The Norm Show".
Walsh also made a guest appearance on ' as Mimosa, a transsexual.
She sometimes appeared in sketches on "Late Night with Conan O'Brien".
She had a recurring role on "Karen Sisco" as Detective Marley Novak in 2003 and 2004.
In 2005, she was cast in the ABC series, "Grey's Anatomy", as Dr. Addison Montgomery, the estranged spouse of Derek Shepherd ("Dr. McDreamy", played by Patrick Dempsey).
It was announced in February 2007 that Walsh's "Grey's Anatomy" character would be in a spin-off of "Grey's Anatomy" that began airing in September 2007.
Taye Diggs, Tim Daly, Amy Brenneman, Chris Lowell, and Audra McDonald were cast in the spin-off, "Private Practice".
Walsh returned to Seattle Grace as a special guest star for episode thirteen in Season 4 and episodes 15 and 16 in Season 5 of "Grey's Anatomy".
She also briefly returned for one episode in season 6 and two episodes in the seventh and eighth seasons.
She continued playing the character of Addison Montgomery on the fourth season of "Private Practice", for which ABC has ordered a full season of episodes.
On January 10, 2011 ABC picked up "Private Practice" for the 2011–2012 fall season (5th season).
Walsh guest-starred in "Song Beneath The Song", a musical episode of "Grey's Anatomy".
Beginning in September 2007, Walsh has appeared in television commercials for the 2008 Cadillac CTS.
She is also the current spokeswoman for Caress' Exotic Oil Infusions body wash. On June 12, 2012, Walsh announced that the sixth season of "Private Practice" would be her final season.
However, she mentioned she'd be open to reprise her role in "Grey's Anatomy" for a few guest spots.
In 2013 Walsh appeared in "Full Circle", a 10-episode ensemble drama series created by Neil LaBute and airing on DirecTV's Audience Network channel. 
In 1998, beginning with its third season, Noxon became a co-producer of "Buffy the Vampire Slayer".
In 1999, upon the beginning of "Buffy" spin-off "Angel", Noxon was promoted by series creator Joss Whedon to supervising producer for its fourth season, which gave her increasing charge of producing "Buffy".
During this season, Noxon cast Amber Benson as Tara Maclay.
Noxon would co-produce the show over its fifth season (2000–2001) with fellow executive co-producer David Fury, as well as direct two episodes ("Into the Woods" and "Forever").
At the 6th season's conclusion, fan reaction was mixed, leading some to criticize Whedon for abandoning creative control and stewardship of "Buffy" to Noxon.
In response, Whedon said:Noxon was executive producer of "Buffy" between 2001 and 2003, for its sixth and seventh seasons.
In the fall of 2005, halfway through its first season, Noxon left "Prison Break", where she had been a consulting producer, citing what she called "creative difficulties.
"In April 2006, Noxon joined the ABC drama "Brothers & Sisters" (which would first air that fall) as showrunner.
Four months later, she left the show, citing "creative differences" with creator Robin Baitz.
In September 2006, Noxon joined the ABC medical drama "Grey's Anatomy" for its third season, as consulting producer.
In April 2007, Noxon left "Grey's Anatomy" to become executive producer and showrunner for "Grey's" spinoff "Private Practice".
She left after its first season to " on to other projects".
In 2008, Noxon worked as a consulting producer on the AMC drama series "Mad Men". 
"Grey's Anatomy" was renewed by ABC on May 10, 2012.
In June 2012, ABC set the premiere date of "Grey's Anatomy" to September 27, 2012, and it would remain in the Thursday at 9:00pm timeslot that it has had since the third season.
In October 2012 it was reported that this season would have the same episode count as season eight, meaning it would have a total of 24 episodes.
Shonda Rhimes revealed that the season nine finale would not revolve around a 'disaster' episode. 
Peter "Pete" Wilder was a character on the "Grey's Anatomy" spin-off "Private Practice".
He is played by actor Tim Daly.
Dr. Pete Wilder's first appearance was in an extended episode of Grey’s Anatomy, The Other Side of This Life.
In Season Six episode 1 (Aftershock) it is revealed by Violet that Pete had suffered a fatal heart attack while on a run.