diff --git a/Cargo.lock b/Cargo.lock
index 553cd53..c54821b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1010,6 +1010,25 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "is-docker"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "928bae27f42bc99b60d9ac7334e3a21d10ad8f1835a4e12ec3ec0464765ed1b3"
+dependencies = [
+ "once_cell",
+]
+
+[[package]]
+name = "is-wsl"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "173609498df190136aa7dea1a91db051746d339e18476eed5ca40521f02d7aa5"
+dependencies = [
+ "is-docker",
+ "once_cell",
+]
+
 [[package]]
 name = "is_terminal_polyfill"
 version = "1.70.2"
@@ -1312,6 +1331,17 @@ version = "1.70.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "384b8ab6d37215f3c5301a95a4accb5d64aa607f1fcb26a11b5303878451b4fe"
 
+[[package]]
+name = "open"
+version = "5.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "43bb73a7fa3799b198970490a51174027ba0d4ec504b03cd08caf513d40024bc"
+dependencies = [
+ "is-wsl",
+ "libc",
+ "pathdiff",
+]
+
 [[package]]
 name = "openssl"
 version = "0.10.75"
@@ -1388,6 +1418,12 @@ dependencies = [
  "windows-link",
 ]
 
+[[package]]
+name = "pathdiff"
+version = "0.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "df94ce210e5bc13cb6651479fa48d14f601d9858cfe0467f43ae157023b938d3"
+
 [[package]]
 name = "percent-encoding"
 version = "2.3.2"
@@ -1757,6 +1793,7 @@ dependencies = [
  "ammonia",
  "clap",
  "crossterm",
+ "open",
  "ratatui",
  "reqwest",
  "serde",
diff --git a/Cargo.toml b/Cargo.toml
index 4a80575..c74dec2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,6 +7,7 @@ edition = "2024"
 ammonia = "4.1.2"
 clap = { version = "4.5.53", features = ["derive"] }
 crossterm = "0.29.0"
+open = "5.3.3"
 ratatui = "0.30.0"
 reqwest = { version = "0.12.28", features = ["json"] }
 serde = { version = "1.0.228", features = ["derive"] }
diff --git a/src/gui.rs b/src/gui.rs
index 70aac14..68415f4 100644
--- a/src/gui.rs
+++ b/src/gui.rs
@@ -49,12 +49,36 @@ pub struct App {
     pub should_quit: bool,
 }
 
+// TODO: The whole architecture of the app may be a bit unusual. Compare with
+// example on https://ratatui.rs/examples/widgets/scrollbar/
+// TODO: Implement exclusion and inclusion of papers (e.g., X and Y chars)
+// TODO: Implement moving through steps and iterations (populating pending papers)
+// TODO: Implement input of seed papers using IDs
+// TODO: Implement possibility of pushing excluded papers back into pending
+// TODO: Implement export of included papers as csv for keywording with a spreadsheet
+// TODO: Implement export of included papers into zotero (Use RIS format somehow)
 impl App {
     fn handle_key(&mut self, key: KeyCode) {
         match key {
             KeyCode::Char('q') => {
                 self.should_quit = true;
             }
+            KeyCode::Enter => match self.active_pane {
+                ActivePane::IncludedPublications => {
+                    open::that(
+                        &self.included_publications[self.included_selected_idx]
+                            .id,
+                    )
+                    .unwrap();
+                }
+                ActivePane::PendingPublications => {
+                    open::that(
+                        &self.pending_publications[self.pending_selected_idx]
+                            .id,
+                    )
+                    .unwrap();
+                }
+            },
             KeyCode::Char('h') => {
                 self.active_pane = ActivePane::IncludedPublications;
             }
@@ -113,6 +137,8 @@ where
     }
 }
 
+// TODO: Implement scrolling. See
+//https://ratatui.rs/examples/widgets/scrollbar/
 fn ui(f: &mut Frame, app: &App) {
     // Root layout
 
diff --git a/src/main.rs b/src/main.rs
index 57b04c6..9fe972a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -61,6 +61,9 @@ impl From<serde_json::Error> for Error {
     }
 }
 
+// TODO: The whole initialization and deinitialization and use of crossterm
+// might be unnecessary. Compare with example on
+// https://ratatui.rs/examples/widgets/scrollbar/
 fn main() -> io::Result<()> {
     let args = Args::parse();
 
diff --git a/src/snowballing.rs b/src/snowballing.rs
index 3536cbe..0b9cbcf 100644
--- a/src/snowballing.rs
+++ b/src/snowballing.rs
@@ -47,7 +47,7 @@ pub fn reconstruct_abstract(inverted_index: &HashMap<String, Vec<u32>>) -> Strin
     sanitized.replace("\u{a0}", " ").trim().to_string()
 }
 
-
+// TODO: Get all papers, not just the first page
 pub async fn get_citing_papers(
     target_id: &str,
     email: &str,