Question: Moominpappa at Sea is a loose reference to a novel written by what American author?

full_context: Document 1: Pippi in the South Seas (book): Pippi in the South Seas is a 1948 sequel to Astrid Lindgren's classic children's books, "Pippi Longstocking" and "Pippi Goes on Board". It is set sometime after the events of the original book and centers around Pippi's further misadventures and experiences, and the main protagonist's theory that the reason for her father's mysterious disappearance that he was hailed as king of an island of natives is confirmed as true.
Document 2: Islands in the Stream (film): Islands in the Stream is a 1977 American drama film, an adaptation of Ernest Hemingway's novel of the same name. The film was directed by Franklin J. Schaffner and starred George C. Scott, Hart Bochner, Claire Bloom, Gilbert Roland, and David Hemmings.
Document 3: Moominvalley in November: Moominvalley in November (Swedish: "Sent i november", 'Late in November'; Finnish: "Muumilaakson marraskuu") is the ninth and final book in the Moomin series by Finnish author Tove Jansson, and was first published in both her native Swedish and English in 1971. Set contemporaneously with her previous novel "Moominpappa at Sea" (1965), it is the only installment in the series where the titular Moomin family are actually absent. Instead it focuses on a set of other characters, including Snufkin, who come to live at Moominhouse during the onset of winter whilst its inhabitants are away, and the various interactions which they have with each other.
Document 4: The Sun Also Rises: The Sun Also Rises is a 1926 novel written by American author Ernest Hemingway about a group of American and British expatriates who travel from Paris to the Festival of San Fermín in Pamplona to watch the running of the bulls and the bullfights. An early and enduring modernist novel, it received mixed reviews upon publication. Hemingway biographer Jeffrey Meyers writes that it is "recognized as Hemingway's greatest work", and Hemingway scholar Linda Wagner-Martin calls it his most important novel. The novel was published in the United States in October 1926 by the publishing house Scribner's. A year later, the London publishing house Jonathan Cape published the novel with the title of Fiesta. Since then it has been continuously in print.
Document 5: Comet in Moominland: Comet in Moominland (Swedish: "Kometjakten" / "Mumintrollet på kometjakt" / "Kometen kommer") is the second in Tove Jansson's series of Moomin books. Published in 1946, it marks the first appearance of several main characters, like Snufkin and the Snork Maiden.
Document 6: The Nick Adams Stories: The Nick Adams Stories is a volume of short stories written by Ernest Hemingway published in 1972, a decade after the author's death. In the volume, all the stories featuring Nick Adams, published in various collections during Hemingway's lifetime, are compiled in a single collection. "The Nick Adams Stories" includes 24 stories and sketches, eight of which were previously unpublished. Some of Hemingway's earliest work such as "Indian Camp" is represented, as well as some of his best known stories such as "Big Two-Hearted River".
Document 7: The Old Man and the Sea (miniseries): The Old Man and the Sea is a 1990 television movie based on the novel "The Old Man and the Sea" by Ernest Hemingway. The film was nominated for three Emmy Awards for Outstanding Achievement in Music for a Miniseries or a Special (Dramatic Underscore), Outstanding Sound Editing for a Miniseries for a Special, and Outstanding Sound Mixing for a Drama Miniseries or Special. Stephen Grubbs also won the Motion Picture Sound Editors Golden Reel Award for Best Sound Editing in Television Long Form - Dialogue & ADR
Document 8: Moominpappa at Sea: Moominpappa at Sea (Swedish: "Pappan och havet", literally "The father and the sea") is the seventh book in the Moomin books by Finnish author Tove Jansson. It is based primarily around the character of Moominpappa. It was first published in 1965. "Moominpappa at Sea" forms the basis of episodes 25 and 26 in the 1990 TV series. The original title is a loose reference to Hemingway novel "The Old Man and the Sea", though this is not reflected in the translation.
Document 9: The Old Man and the Sea (1999 film): The Old Man and the Sea ("Старик и море" ) is a 1999 paint-on-glass-animated short film directed by a Russian animator Aleksandr Petrov, based on the novel of the same name by Ernest Hemingway. The film won many awards, including the Academy Award for Animated Short Film.
Document 10: Ernest Hemingway House: The Ernest Hemingway House, officially known as the Ernest Hemingway Home & Museum, was the residence of author Ernest Hemingway in Key West, Florida, United States. It is located at 907 Whitehead Street, across from the Key West lighthouse, close to the Southern coast of the island. On November 24, 1968, it was designated a U.S. National Historic Landmark.
Document 11: Moomin (1990 TV series): Moomin (Japanese: 楽しいムーミン一家 , Hepburn: Tanoshii Mūmin Ikka , "Delightful Moomin Family") is a Japanese-Finnish-Dutch anime television series produced by Telecable Benelux B.V.. Based on the "Moomin" novels and comic strips by the Finnish illustrator and author Tove Jansson and her brother Lars Jansson, it was the third anime adaptation of the property and the first to receive distribution in other countries worldwide. "Moomin" first aired on TV Tokyo from April 12, 1990 to October 3, 1991. The series has also been dubbed English and aired on CBBC in United Kingdom during the same year.
Document 12: The Complete Short Stories of Ernest Hemingway: The Complete Short Stories of Ernest Hemingway: The Finca Vigía Edition, is a posthumous collection of Ernest Hemingway's (July 21, 1899 – July 2, 1961) short fiction, published in 1987. It contains the classic "First Forty-Nine Stories" plus a number of other works and a foreword by his sons.
Document 13: The Old Man and the Sea: The Old Man and the Sea is a short novel written by the American author Ernest Hemingway in 1951 in Bimini, Bahamas, and published in 1952. It was the last major work of fiction by Hemingway that was published during his lifetime. One of his most famous works, it tells the story of Santiago, an aging Cuban fisherman who struggles with a giant marlin far out in the Gulf Stream off the coast of Florida.
Document 14: Pippi in the South Seas (film): Pippi in the South Seas (original title: "Pippi Långstrump på de sju haven") is a 1970 Swedish movie, based on the eponymous children's books by Astrid Lindgren with the cast of the 1969 TV series "Pippi Longstocking". It was released in the USA in 1975.
Document 15: Pippi Goes on Board (book): Pippi Goes on Board is a 1946 sequel to Astrid Lindgren's classic children's chapter book, "Pippi Longstocking". It was followed by a further sequel "Pippi in the South Seas". It was filmed in 1969 for a TV series and edited into a film in 1969.
ground_truth: Ernest Hemingway